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Статті в журналах з теми "MoS2 material"
1
Chen, Tianrui. "Investigation of 2D material anodes with different anions for lithium ion batteries: comparison of MoO2, MoS2 and MoSe2." Journal of Physics: Conference Series 2331, no. 1 (August 1, 2022): 012005. http://dx.doi.org/10.1088/1742-6596/2331/1/012005.
Повний текст джерелаАнотація:
Abstract The energy storage devices used in today’s society are mainly lithium batteries. At present, the anode material of commercial lithium batteries is generally graphite. Although lithium battery has superior performance compared with other energy storage methods, it still has many problems, such as poor safety, low specific capacity, and slow charging speed. In recent years, although some researchers have proposed graphene as anode material, the results show that although graphene can partly alleviate the above problems, it cannot meet the needs of industrial and domestic applications. Therefore, we investigate the properties of MoO2, MoS2 and MoSe2 as battery anode materials. These three materials have good conductivity, and anions are the same main group. The effects of anionic electronegativity on battery performance can be compared and discussed. We obtain the binding energy, diffusion barrier, voltage, stable adsorption site and corresponding charge transfer of Li on the above three materials by first-principles calculations. We find that MoO2, MoS2 and MoSe2 have their own advantages and disadvantages as battery anode materials. MoO2 has the strongest binding capacity with lithium ion and the closest adsorption degree. MoS2 is slightly inferior and MoSe2 has the weakest binding capacity. This feature will lead to MoO2 having higher specific capacity and the ability to prevent lithium dendrite growth. However, considering the lower diffusion barrier, lithium ion in MoSe2 is easier to diffuse and the charging rate of the MoSe2 based lithium battery would be higher, while lithium ion in MoO2 is not easy to diffuse and the charging rate could be low. In general, the three anode can improve the battery performance in different aspects, and have a wide application prospect.
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Dong, Daoyu, Weitao Yan, Yaqiu Tao, Yunfei Liu, Yinong Lu, and Zhigang Pan. "Preparation and Photocatalytic Performance of MoS2/MoO2 Composite Catalyst." Materials 16, no. 11 (May 28, 2023): 4030. http://dx.doi.org/10.3390/ma16114030.
Повний текст джерелаАнотація:
Solar energy is an inexhaustible clean energy providing a key solution to the dual challenges of energy and environmental crises. Graphite-like layered molybdenum disulfide (MoS2) is a promising photocatalytic material with three different crystal structures, 1T, 2H and 3R, each with distinct photoelectric properties. In this paper, 1T-MoS2 and 2H-MoS2, which are widely used in photocatalytic hydrogen evolution, were combined with MoO2 to form composite catalysts using a bottom-up one-step hydrothermal method. The microstructure and morphology of the composite catalysts were studied by XRD, SEM, BET, XPS and EIS. The prepared catalysts were used in the photocatalytic hydrogen evolution of formic acid. The results show that MoS2/MoO2 composite catalysts have an excellent catalytic effect on hydrogen evolution from formic acid. By analyzing the photocatalytic hydrogen production performance of composite catalysts, it suggests that the properties of MoS2 composite catalysts with different polymorphs are distinct, and different content of MoO2 also bring differences. Among the composite catalysts, 2H-MoS2/MoO2 composite catalysts with 48% MoO2 content show the best performance. The hydrogen yield is 960 µmol/h, which is 1.2 times pure 2H-MoS2 and two times pure MoO2. The hydrogen selectivity reaches 75%, which is 22% times higher than that of pure 2H-MoS2 and 30% higher than that of MoO2. The excellent performance of the 2H-MoS2/MoO2 composite catalyst is mainly due to the formation of the heterogeneous structure between MoS2 and MoO2, which improves the migration of photogenerated carriers and reduces the possibilities of recombination through the internal electric field. MoS2/MoO2 composite catalyst provides a cheap and efficient solution for photocatalytic hydrogen production from formic acid.
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Neupane, Hari Krishna, and Narayan Prasad Adhikari. "Structural, Electronic and Magnetic Properties of Defected Water Adsorbed Single-Layer MoS2." Journal of Institute of Science and Technology 26, no. 1 (June 17, 2021): 43–50. http://dx.doi.org/10.3126/jist.v26i1.37817.
Повний текст джерелаАнотація:
Water adsorbed in MoS2 (wad-MoS2), 1S atom vacancy defect in wad-MoS2 (1S-wad-MoS2), 2S atoms vacancy defects in wad-MoS2 (2S-wad-MoS2), and 1Mo atom vacancy defect in wad-MoS2 (Mo-wad-MoS2) materials were constructed, and their structural, electronic, and magnetic properties were studied by spin-polarized density functional theory (DFT) based first-principles calculations. The wad-MoS2, 1S-wad-MoS2, 2S-wad-MoS2, and Mo-wad-MoS2 materials were found stable. From band structure calculations, wad-MoS2, 1S-wad-MoS2 and 2S-wad-MoS2 materials open energy bandgap of values 1.19 eV, 0.65 eV and 0.38 eV respectively. Also, it was found that the conductivity strength of the material increases with an increase in the concentration of S atom vacancy defects in the structure. On the other hand, the Mo-wad-MoS2 material has metallic properties because energy bands of electrons crossed the Fermi energy level in the band structure. For the investigation of magnetic properties, the density of states (DoS) and partial density of states (PDoS) calculations were used and found that wad-MoS2, 1S-wad-MoS2, and 2S-wad-MoS2 are non-magnetic materials, while Mo-wad-MoS2 is a magnetic material. The total magnetic moment of Mo-wad-MoS2 has a value of 2.66 µB/cell, due to the arrangement of unpaired up-spin and down-spin of electrons in 3s & 3p orbitals of S atoms; and 4p, 4d & 5s orbitals of Mo atoms in the material.
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Jagminas, Arunas, Paulius Gaigalas, Carla Bittencourt, and Vaclovas Klimas. "Cysteine-Induced Hybridization of 2D Molybdenum Disulfide Films for Efficient and Stable Hydrogen Evolution Reaction." Materials 14, no. 5 (March 2, 2021): 1165. http://dx.doi.org/10.3390/ma14051165.
Повний текст джерелаАнотація:
The noble, metal-free materials capable of efficiently catalyzing water splitting reactions currently hold a great deal of promise. In this study, we reported the structure and electrochemical performance of new MoS2-based material synthesized with L-cysteine. For this, a facile one-pot hydrothermal process was developed and an array of densely packed nanoplatelet-shaped hybrid species directly on a conductive substrate were obtained. The crucial role of L-cysteine was determined by numerous methods on the structure and composition of the synthesized material and its activity and stability for hydrogen evolution reaction (HER) from the acidic water. A low Tafel slope of 32.6 mV dec−1, close to a Pt cathode, was registered for the first time. The unique HER performance at the surface of this hybrid material in comparison with recently reported MoS2-based electrocatalysts was attributed to the formation of more defective 1T, 2H-MoS2/MoOx, C nanostructures with the dominant 1T-MoS2 phase and thermally degraded cysteine residues entrapped. Numerous stacks of metallic (1T-MoS2 and MoO2) and semiconducting (2H-MoS2 and MoO3) fragments relayed the formation of highly active layered nanosheets possessing a low hydrogen adsorption free energy and much greater durability, whereas intercalated cysteine fragments had a low Tafel slope of the HER reaction. X-ray photoelectron spectroscopy, scanning electron microscopy, thermography with mass spectrometry, high-resolution transmission electron microscopy, Raman spectroscopy techniques, and linear sweep voltammetry were applied to verify our findings.
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Senthil Kumar, S., R. Sudhakara Pandian, P. Pitchipoo, S. Rajakarunakaran, and S. Rajesh. "Investigation of Al-Mg based composite incorporated with MoS2 through powder metallurgy." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 235, no. 4 (January 10, 2021): 986–96. http://dx.doi.org/10.1177/0954408920985761.
Повний текст джерелаАнотація:
In this study, powder metallurgy process has been utilized to produce the composite materials. Pure aluminium (Al) has been selected as the matrix material for the preparation of composite materials. 4% of magnesium (Mg) has been added as the alloying element, whilst molybdenum disulphide (MoS2) is reinforced with a varying wt.% (2, 4 & 6). The intent of this work is, to evaluate some basic mechanical properties (density, microhardness, compression strength and toughness), surface degradation properties (corrosion and wear), and electrical conductivity of the fabricated composite materials. Moreover, SEM mapping and EDAX analysis have been conducted to confirm the presence of reinforcement particles with homogenous distribution in the matrix material and to do the fractographic study of the compressive strength tested samples. The density of the composite material Al-4% Mg-6%MoS2 has been increased compared to the density of pure Al material. Micro Vickers hardness test shows that Al-4% Mg-6%MoS2 composite has 32.86% more hardness as compared to that of pure Al material. Compressive strength of the composite material with the higher wt.% of MoS2 is found to be 181.81 N/mm2, while Al material has only 167.52 N/mm2. The buckling formation during the compression test is avoided in the composite material owing to the existence of MoS2 particulates. The wear loss of composite materials is found low as compared with the unreinforced Al material, owing to the solid lubricant property of MoS2 particles, and hence, coefficient of friction (COF) is also lessened with the increase in the MoS2 wt.%. Also, the MoS2 reinforced materials show good resistance to corrosion due to the presence of molybdenum, which acts as a consistent layer obstacle to prevent the surface from further degradation.
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Neupane, H. K., and N. P. Adhikari. "Structural, Electronic and Magnetic Properties of Impurities Defected Graphene/MoS2 Van Der Waals Heterostructure: First-principles Study." Journal of Nepal Physical Society 7, no. 2 (June 30, 2021): 1–8. http://dx.doi.org/10.3126/jnphyssoc.v7i2.38578.
Повний текст джерелаАнотація:
Two-dimensional (2D) pristine and defected van der Waals (vdW) heterostructure (HS) materials open up fortune in nanoelectronic and optoelectronic devices. So, they are compatible for designing in the fields of device applications. In the present work, we studied structural, electronic and magnetic properties of vdW (HS) graphene/MoS2 ((HS)G/MoS2), Nb impurity defect in vdW (HS) graphene/MoS2 (Nb-(HS)G/MoS2), and Tc impurity defect in vdW (HS) graphene/MoS2 (Tc-(HS)G/MoS2) materials by using spin-polarized DFT-D2 method. We examined the structure of these materials, and found that they are stable. Based on band structure analysis, we found that (HS)G/MoS2, Nb-(HS)G/MoS2 and Tc-(HS)G/MoS2 have metallic characteristics. Also, (HS)G/MoS2 and Tc-(HS)G/MoS2 materials have n-type Schottky contact, while Nb-(HS)G/MoS2 material has p-type Schottky contact. To understand the magnetic properties of materials, we have used DoS, IDoS and PDoS calculations. We found that (HS)G/MoS2 is a non-magnetic material, but Nb-(HS)G/MoS2 and Tc-(HS)G/MoS2 are magnetic materials. Magnetic moment of Nb-(HS)G/MoS2 and Tc-(HS)G/MoS2 materials are -0.24 μB/cell and +0.07μB/cell values respectively from DoS/PDoS calculations, and 0.26 μB/cell and 0.08μB/cell values respectively from IDoS calculations. Up-spin and down-spin states of electrons in 2p orbital of C atoms, 3p orbital of S atoms, 4d orbital of Mo atoms, 4d orbital of Tc atom in Tc-(HS)G/MoS2, and 2p orbital of C atoms, 3p orbital of S atoms, 4p & 4d orbitals of Mo atoms, 4p & 4d orbitals of Nb atom in Nb-(HS)G/MoS2 have major contribution for the development of magnetic moment.
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Ochedowski, Oliver, Kolyo Marinov, Nils Scheuschner, Artur Poloczek, Benedict Kleine Bussmann, Janina Maultzsch, and Marika Schleberger. "Effect of contaminations and surface preparation on the work function of single layer MoS2." Beilstein Journal of Nanotechnology 5 (March 13, 2014): 291–97. http://dx.doi.org/10.3762/bjnano.5.32.
Повний текст джерелаАнотація:
Thinning out MoS2 crystals to atomically thin layers results in the transition from an indirect to a direct bandgap material. This makes single layer MoS2 an exciting new material for electronic devices. In MoS2 devices it has been observed that the choice of materials, in particular for contact and gate, is crucial for their performance. This makes it very important to study the interaction between ultrathin MoS2 layers and materials employed in electronic devices in order to optimize their performance. In this work we used NC-AFM in combination with quantitative KPFM to study the influence of the substrate material and the processing on single layer MoS2 during device fabrication. We find a strong influence of contaminations caused by the processing on the surface potential of MoS2. It is shown that the charge transfer from the substrate is able to change the work function of MoS2 by about 40 meV. Our findings suggest two things. First, the necessity to properly clean devices after processing as contaminations have a great impact on the surface potential. Second, that by choosing appropriate materials the work function can be modified to reduce contact resistance.
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Neupane, Hari Krishna, and Narayan Prasad Adhikari. "Structural, electronic and magnetic properties of S sites vacancy defects graphene/MoS2 van der Waals heterostructures: First-principles study." International Journal of Computational Materials Science and Engineering 10, no. 02 (June 2021): 2150009. http://dx.doi.org/10.1142/s2047684121500093.
Повний текст джерелаАнотація:
In this work, we investigated the geometrical structures, electronic and magnetic properties of S sites vacancy defects in heterostructure graphene/molybdenum disulphide ((HS)G/MoS[Formula: see text] material by performing first-principles calculations based on spin polarized Density Functional Theory (DFT) method within van der Waals (vdW) corrections (DFT-D2) approach. All the structures are optimized and relaxed by BFGS method using computational tool Quantum ESPRESSO (QE) package. We found that both (HS)G/MoS2 and S sites vacancy defects in (HS)G/MoS2 (D1S–(HS)G/MoS2, U1S–(HS)G/MoS2, 2S–(HS)G/MoS2 and 3S–(HS)G/MoS[Formula: see text] are stable materials, and atoms in defects structures are more compact than in pristine (HS)G/MoS2 structure. From band structure calculations, we found that (HS)G/MoS2, (D1S–(HS)G/MoS2, U1S–(HS)G/MoS2, 2S–(HS)G/MoS2 and 3S–(HS)G/MoS[Formula: see text] materials have [Formula: see text]-type Schottky contact. The Dirac cone is formed in conduction band of the materials mentioned above. The barrier height of Dirac cones from Fermi energy level of (HS)G/MoS2, (D1S–(HS)G/MoS2, U1S–(HS)G/MoS2, 2S–(HS)G/MoS2 and 3S–(HS)G/MoS[Formula: see text] materials have values 0.56[Formula: see text]eV, 0.62[Formula: see text]eV, 0.62[Formula: see text]eV, 0.64[Formula: see text]eV and 0.65[Formula: see text]eV, respectively, which means they have metallic properties. To study the magnetic properties of materials, we have carried out DoS and PDoS calculations. We found that (HS)G/MoS2, D1S–(HS)G/MoS2 and U1S–(HS)G/MoS2 materials have non-magnetic properties, and 2S–(HS)G/MoS2 and 3S–(HS)G/MoS2 materials have magnetic properties. Therefore, the non-magnetic (HS)G/MoS2 changes to magnetic 2S–(HS)G/MoS2 and 3S–(HS)G/MoS2 materials due to 2S and 3S atoms vacancy defects, respectively, in (HS)G/MoS2 material. Magnetic moment obtained in 2S–(HS)G/MoS2 and 3S–(HS)G/MoS2 materials due to the unequal distribution of up and down spin states of electrons in 2s and 2p orbitals of C atoms; 4p, 4d and 5s orbitals of Mo atoms; and 3s and 3p orbitals of S atoms in structures. Magnetic moment of 2S–(HS)G/MoS2 and 3S–(HS)G/MoS2 materials is −0.11[Formula: see text][Formula: see text]/cell and [Formula: see text]/cell, respectively, and spins of 2p orbital of C atoms, 3p orbital of S atoms and 4d orbital of Mo atoms have dominant role to create magnetism in 2S–(HS)G/MoS2 and 3S–(HS)G/MoS2 materials.
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Bui, Hoa, Nguyen Duc Lam, Bui Xuan Khuyen, Bui Son Tung, Man Hoai Nam, Nguyen Thi Ngoc Anh, Do Chi Linh, Duong Thi Huong, and Pham Thi San. "Synthesis and characterization of in-situ MoS2-graphene hybrid nanostructured material." Journal of Military Science and Technology, no. 81 (August 26, 2022): 122–27. http://dx.doi.org/10.54939/1859-1043.j.mst.81.2022.122-127.
Повний текст джерелаАнотація:
Nowadays, it has been challenging to develop novel techniques and synthesis processes for hybrid two-dimensional materials. Hence, this research presents an innovative technique for the fabrication of MoS2-Graphene (MoS2-Gr) hybrid nanostructured materials. The graphene was effectively generated in-situ and incorporated into the interlayer spacing of MoS2, which was synthesized by using a co-precipitation process with diethyl glycol as the solvent, followed by annealing the as-synthesized MoS2 at 800 oC for two hours in an inert atmosphere. The integrated graphene enhanced the width of MoS2 interlayers, exposing a substantial concentration of active edge sites in the hybrid material, according to SEM, XRD, HR-TEM, and other characterizations. This research might lead to the development of viable hybrid structured materials for various applications. In addition, this study outlines a novel advanced approach for creating hybrid 2D nanostructured materials with superior characteristics.
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Neupane, Hari Krishna, and Narayan Prasad Adhikari. "Electronic and magnetic properties of defected MoS2 monolayer." BIBECHANA 18, no. 2 (April 17, 2021): 68–79. http://dx.doi.org/10.3126/bibechana.v18i2.33905.
Повний текст джерелаАнотація:
It is interesting to understand the effect of defects in 2D materials because vacancy defects in 2D materials have novel electronic and magnetic properties. In this work, we studied electronic and magnetic properties of 1S vacancy defect (1Sv-MoS2), 2S vacancy defects (2Sv-MoS2), 1Mo vacancy defect (Mov-MoS2), and (1Mo & 1S) vacancy defects ((Mo-S)v-MoS2) in 2D MoS2 material by first-principles calculations within spin-polarized density functional theory (DFT) method. To understand the electronic properties of materials, we have analyzed band structures and DOS calculations and found that 1Sv-MoS2 & 2Sv-MoS2 materials have semiconducting nature. This is because, 1Sv-MoS2 & 2Sv-MoS2 materials open a small energy band gap of values 0.68 eV & 0.54 eV respectively in band structures. But, in Mov-MoS2 & (Mo-S)v-MoS2 materials, energy bands around the Fermi level mix with the orbital’s of Mo and S atoms. As a result, bands are split and raised around and above the Fermi energy level. Therefore, Mov-MoS2 & (Mo-S)v-MoS2 materials have metallic nature. We found that MoS2, 1Sv-MoS2 & 2Sv-MoS2 materials have non-magnetic properties, and Mov-MoS2 & (Mo-S)v-MoS2 materials have magnetic properties because magnetic moment of MoS2, 1Sv-MoS2 & 2Sv-MoS2 materials have 0.00 µB/cell value and Mov-MoS2 & (Mo-S)v-MoS2 materials have 2.72 µB/cell & 0.99 µB/cell respectively. Therefore, non-magnetic MoS2 changes to magnetic Mov-MoS2 & (Mo-S)v-MoS2 materials due to Mo and (1Mo & 1S) vacancy defects. The magnetic moment obtained in Mov-MoS2 & (Mo-S)v-MoS2 materials due to the distribution of up and down spins in 4p, 4d & 5s orbitals of Mo atoms and 3s & 3p orbitals of S atoms in structures. The significant values of the magnetic moment are given by distributed spins in 4d orbital of Mo atoms and 3p orbital of S atoms.
BIBECHANA 18 (2) (2021) 68-79
Дисертації з теми "MoS2 material"
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Singh, Harpal. "An Investigation of Material Properties and Tribological Performance of Magnetron Sputtered Thin Film Coatings." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1449850005.
Повний текст джерела
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Ma, Lu. "Synthesis and Characterization of Large Area Few-layer MoS2 and WS2 Films." The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1388149255.
Повний текст джерела
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Ma, Lu. "Mo-S Chemistry: From 2D Material to Molecular Clusters." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480268313180315.
Повний текст джерела
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Nasseri, Mohsen. "NANOSCALE DEVICES CONSISTING OF HETEROSTRUCTURES OF CARBON NANOTUBES AND TWO-DIMENSIONAL LAYERED MATERIALS." UKnowledge, 2018. https://uknowledge.uky.edu/physastron_etds/59.
Повний текст джерелаАнотація:
One dimensional carbon nanotubes (CNTs) and two-dimensional layered materials like graphene, MoS2, hexagonal boron nitride (hBN), etc. with different electrical and mechanical properties are great candidates for many applications in the future. In this study the synthesis and growth of carbon nanotubes on both conducting graphene and graphite substrates as well as insulating hBN substrate with precise crystallographic orientation is achieved. We show that the nanotubes have a clear preference to align to specific crystal directions of the underlying graphene or hBN substrate. On thicker flakes of graphite, the edges of these 2D materials can control the orientation of these carbon nanotubes. This integrated aligned growth of materials with similar lattices provides a promising route to achieving intricate nanoscale electrical circuits. Furthermore, short channel nanoscale devices consisting of the heterostructure of 1D and 2D materials are fabricated. In these nanoscale devices the nanogap is created due to etching of few layer graphene flake through hydrogenation and the channel is either carbon nanotubes or 2D materials like graphene and MoS2. Finally the transport properties of these nanoscale devices is studied.
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Chen, Zhesheng. "Novel two dimensional material devices : from fabrication to photo-detection." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066595/document.
Повний текст джерелаАнотація:
Au delà du graphène, de nouveaux semiconducteurs 2D tels que MoS2, GaS, GaSe et InSe deviennent pertinents pour les applications et dispositifs émergents. Dans cette thèse, nous fabriquons des échantillons de quelques feuillets atomiques de ces matériaux pour des dispositifs de photo-détecteurs et les caractérisons par microscopie optique, AFM et TEM. L'interaction de la lumière avec le substrat et le dispositif ultra-mince étant critique pour son fonctionnement, nous calculons et mesurons le contraste et l'intensité de la lumière diffusée par le dispositif. Nous caractérisons également la réponse Raman et la photoluminescence en fonction du nombre de couches pour étudier les propriétés vibrationnelles et électroniques. Plusieurs dispositifs ont été fabriqués et analysés. Nous examinons d'abord les dispositifs homogènes basés sur MoS2, GaSe ou InSe, et trouvons une excellente photosensibilité pour notre photo-détecteur MoS2. Nous examinons ensuite plusieurs hétéro-structures pour combiner les propriétés de chaque matériau et atteindre de meilleures performances. Le premier exemple est un photo-détecteur graphène/InSe dont la photosensibilité augmente de quatre ordres de grandeur par rapport à un dispositif basés sur InSe seul. Nous montrons également que la couche supérieure de graphène prévient la dégradation de couches atomiques ultra-minces dans l'air. Des hétéro-structures plus complexes graphène/InSe/graphène et graphène/InSe/Au montrent un effet photovoltaïque. Enfin, nous combinons InSe avec MoS2 et obtenons un dispositifs avec photo-réponse rapide, un comportement de type photo-diode, une distribution de photo-courant uniforme et un fort effet photovoltaïqueNovel two dimensional (2D) semiconductors beyond graphene such as MoS2, GaS, GaSe and InSe are increasingly relevant for emergent applications and devices. In this thesis, we fabricate these 2D samples for photo-detector applications and characterize them with optical microscopy, atomic force microscopy, Raman and photoluminescence (PL) spectroscopy and transmission electron microscopy. Since the interaction of light with the substrate and the ultra-thin photodetector device is critical for its functioning we calculate and measure optical contrast and intensity of light scattered from the device. We also characterize the Raman and PL response as a function of number of layers to study both vibrational properties and the band gap transition. For the device application, we first examine homogenous devices based on few-layer MoS2, GaSe and InSe respectively and find an excellent photoresponsivity in our few-layer MoS2 photo-detector. We then examine several geometries for heterostructure devices, which have the advantage of combining favorable properties of each material to reach better performances. The first example is a graphene/InSe photo-detector where the photoresponsivity increases by four orders of magnitude with respect to a few-layer InSe device while the top graphene layer is also shown to prevent degradation of ultra-thin atomic layers in air. Still more complex graphene/InSe/graphene and graphene/InSe/Au heterostructures show a photovoltaic effect. Finally for the first time, we combine InSe with MoS2 and obtain a high performance device with fast photo-response, photodiode like behavior, uniform photocurrent distribution and high photovoltaic effect
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Mosconi, Dario. "Crashing flatland: defective and hybrid 2D-materials for (Electro) catalysis." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3426844.
Повний текст джерелаАнотація:
This Ph.D. project is aimed to discover new strategies to develop materials to utilize in the fields of Green Energy and Green Chemistry and it was directed at the application of 2D Materials in particular. This thesis is divided into five main chapters where we presented five exemplary systems in which we focused our attention on different aspects of materials design. Each chapter comprises an introduction and a conclusion section, in which we tried to go into the details of each targeted application and of the specific design strategy employed. However, at the beginning and at the end of the thesis, the reader can find an Introduction and a Conclusion section where we tried to collocate the goals and challenges of this work within a broader context of materials science and catalysis/electrocatalysis.
In our studies in the Green Energy area, we focused on the use of MoS2-based materials in water splitting cathodic half-reaction in order to obtain the best possible performance in hydrogen generation in different conditions. To do that, different strategies were developed to drive the original material to adapt to specific application. In detail, in Chapter Two we investigated the design of three-dimensional MoS2 structures doped with different amount of Ni in order to activate MoS2 for the Hydrogen Evolution Reaction (HER) performed in alkaline environment, which typically hinder this reaction. We carried out an extensive structural characterization in order to establish the role of each type of active sites formed on the material in the HER activity and kinetics. In Chapter Three, we developed an electrodeposition method for preparing amorphous MoS2/Ag2S hybrid using recycled DVD as the support; this revealed as a viable opportunity to turn an abundant waste into an added-value material. After a suitable investigation to understand what kind of material was formed upon electrodeposition, MoS2/Ag2S/DVD was tested for HER in acidic medium. In Chapter Four another kind of hybrid was prepared by designing a one-pot solvothermal synthesis of MoS2(1-x)Se2x nanosheets grown on N-doped reduced Graphene Oxide (N-rGO). The goal was the control of the optoelectronic properties of the final material, since the combination of MoS2(1-x)Se2x and N-rGO allows to form p-n nanojunctions, which induce an enhancement of HER activity upon illumination with visible light. Then we used different techniques to prove what was the best Se:S ratio to optimize both the absolute performances in HER and the enhancement upon light irradiation.
Regarding Green Chemistry area, we used Graphene Acid (GA) as starting material and we exploited its uniform surface functionalization to prepare materials for heterogeneous catalysis for different reactions, comparing them with the benchmark Graphene Oxide (GO), modified with the same protocol. In Chapter Five, we synthesized a heterogeneous catalyst by covalently grafting Ferrocene (Fc) moieties to –COOH surface groups of GA and GO. The resulting Fc-modified graphene derivatives have been tested as heterogeneous catalysts for the C-H insertion of aryl diazonium salts into several arene substrates. The tests revealed a strong influence of the support, which we could attribute the intrinsic properties of GA. In Chapter Six, we have grown Pd nanoparticles on GA to prepare a catalyst for Suzuki-Miyaura cross coupling reaction. We have studied the effect of surface functionalization on the nanoparticles formation process and on the derived capability on the controlling the size distribution. The catalysts were tested in Suzuki cross coupling in green conditions and we could highlight the influence of nanoparticles size on activity. Moreover, we studied the same catalysts also for boronic acid homocoupling reaction, that can provide similar final products, but in a more atom economically way.Questo progetto di dottorato è mirato alla scoperta di nuove strategie per lo sviluppo di materiali da utilizzare nei campi della Green Energy e della Green Chemistry ed è rivolto all’applicazione dei materiali 2D in particolare. Questa tesi è divisa in cinque capitoli principali dove presentiamo cinque sistemi esemplificativi in cui ci siamo focalizzati su diversi aspetti del design del materiale. Ogni capitolo comprende una sezione di introduzione e una di conclusione, in cui abbiamo provato ad andare nel dettaglio di ogni applicazione e della specifica strategia di design utilizzata. In ogni caso, all’inizio e alla fine della tesi, il lettore può trovare una sezione di Introduzione e una di Conclusione dove abbiamo provato a collocare gli obbiettivi e le sfide di questo lavoro in un contesto più ampio della scienza dei materiali e della catalisi/elettrocatalisi. Nei nostri studi nell’area della Green Energy, ci siamo focalizzati sull’utilizzo di materiali a base MoS2 per la riduzione dell’acqua così da ottenere le migliori performance possibile nella generazione di idrogeno in diverse condizioni. Abbiamo sviluppato diverse strategie per indurre il materiale originale ad adattarsi alla specifica applicazione. Nel Capitolo Due abbiamo investigato il design di strutture 3D di MoS2 drogato con diverse quantità di Ni, con lo scopo di attivare il MoS2 per Hydrogen Evolution Reaction (HER) in ambiente alcalino, che di solito ostacola la reazione. Abbiamo eseguito un’estensiva analisi strutturale per stabilire il ruolo di ogni tipo di sito attivo formato sul materiale nell’attività e nella cinetica della HER. Nel Capitolo Tre, abbiamo sviluppato un metodo di elettrodeposizione per preparare un ibrido MoS2/Ag2S amorfo usando DVD riciclati come supporto, rivelandosi un’ottima strada per ridare valore a un materiale di scarto. Dopo un’adeguata analisi per capire il tipo di materiale formato, MoS2/Ag2S/DVD è stato testato per la HER in ambiente acido. Nel Capitolo Quattro abbiamo preparato un ibrido ottimizzando una sintesi solvotermale di nanofogli di MoS2(1-x)Se2x su Grafene Ossido ridotto drogato-N (N-rGO). L’obiettivo era il controllo delle proprietà optoelettroniche del materiale, dato che la combinazione di MoS2(1-x)Se2x e N-rGO permette di formare nanogiunzione p-n, che inducono un aumento dell’attività HER sotto illuminazione. Abbiamo utilizzato differenti tecniche per provare quale fosse il miglior rapporto Se:S per ottimizzare sia la performance assoluta in HER sia l’incremento dovuto all’irradiamento. Riguardo all’area della Green Chemistry, abbiamo utilizzato il Grafene Acido (GA) come materiale di partenza e abbiamo sfruttato la sua funzionalizzazione superficiale uniforme per preparare materiali per catalisi eterogenea di diverse reazioni, comparandoli con il riferimento Grafene Ossido (GO), modificato con la stessa procedura. Nel Capitolo Cinque, abbiamo sintetizzato un catalizzatore eterogeneo attaccando unità di Ferrocene (Fc) a GA e GO. I risultanti derivati grafenici modificati con Fc sono stati testati come catalizzatori eterogenei per l’inserimento di sali di diazonio aromatici in substrati arenici. I test hanno rivelato una forte incidenza del supporto, attribuibile alle proprietà intrinseche del GA. Nel Capitolo Sei, abbiamo cresciuto nanoparticelle di Pd sul GA per preparare un catalizzatore per la reazione di cross coupling Suzuki-Miyaura. Abbiamo studiato gli effetti della chimica superficiale sul processo di formazione delle nanoparticelle e sulla conseguente capacità di controllare la taglia. I catalizzatori sono stati testati nella Suzuki-Miyaura in condizioni green e abbiamo potuto evidenziare l’influenza della taglia delle nanoparticelle sull’attività. In aggiunta, abbiamo studiato gli stessi catalizzatori anche per la reazione di homocoupling di acidi boronici, la quale può fornire simili prodotti finali, ma con un migliore economia atomica.
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Curcella, Alberto. "Looking for silicene: studies of silicon deposition on metallic and semiconductor substrates." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9314/.
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Nel presente lavoro espongo i risultati degli esperimenti svolti durante la mia internship all’Institut des NanoSciences de Paris (INSP), presso l’Università Pierre et Marie Curie (Paris VI), nel team "Phisico-Chimie et Dynamique des Surfaces", sotto la supervisione del Dott. Geoffroy Prévot. L’elaborato è stato redatto e in- tegrato sotto la guida del Dott. Pasquini, del dipartimento di Fisica e Astronomia dell’Università di Bologna. La tesi s’inserisce nel campo di ricerca del silicene, i.e. l’allotropo bidimensionale del silicio. Il cosidetto free-standing silicene è stato predetto teoricamente nel 2009 utilizzando calcoli di Density Functional Theory, e da allora ha stimolato un’intensa ricerca per la sua realizzazione sperimentale. La sua struttura elettronica lo rende particolarmente adatto per eventuali appli- cazioni tecnologiche e sperimentali, mentre lo studio delle sue proprietà è di grande interesse per la scienza di base.
Nel capitolo 1 presento innanzitutto la struttura del silicene e le proprietà previste dagli studi pubblicati nella letteratura scientifica. In seguito espongo alcuni dei risultati sperimentali ottenuti negli ultimi anni, in quanto utili per un paragone con i risultati ottenuti durante l’internship.
Nel capitolo 2 presento le tecniche sperimentali che ho utilizzato per effettuare le misure. Molto tempo è stato investito per ottenere una certa dimistichezza con gli apparati in modo da svolgere gli esperimenti in maniera autonoma.
Il capitolo 3 è dedicato alla discussione e analisi dei risultati delle misure, che sono presentati in relazione ad alcune considerazioni esposte nel primo capitolo.
Infine le conclusioni riassumono brevemente quanto ottenuto dall’analisi dati. A partire da queste considerazioni propongo alcuni esperimenti che potrebbero ulteriormente contribuire alla ricerca del silicene. I risultati ottenuti su Ag(111) sono contenuti in un articolo accettato da Physical Review B.
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Stoyanov, Pantcho. "Micro-tribological performance of metal-doped MoS2 coatings." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103709.
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The mechanical and tribological properties of pure MoS2, pure Au, Au-MoS2 and Ti-MoS2 coatings were evaluated and examined at a microscopic scale. The metal doped MoS2 coatings had varying metal content, 5-10at% for Ti and 10-90% for Au. Reciprocating sliding wear tests were performed with a range of initial Hertzian contact pressures from 0.41 to 3.5 GPa and in air at two humidity levels (i.e. "low" being 3-5%RH and "high" being 30-40%RH). Titanium and gold were chosen for this study as metal additives due to their positive influence on the mechanical properties of the coating. The friction and wear behavior at the micro-scale were directly compared to tribological properties at the macro-scale, which were performed using an in situ tribometer. Reciprocating micro- and macro- wear tests were performed with spherical diamond tip (with 10 and 50 µm radii) and a sapphire tip (with a radius of 3.175 mm), respectively. The range of initial Hertzian contact pressures for macro-scale (i.e. between 0.41GPa and 1.2GPa) overlapped with that for micro-scale. However, the initial Hertzian contact diameters (2*a) were very different (i.e. 0.8-2.3 µm for micro-scale and 60-180 µm for macro-scale). It was observed that the small addition of Ti or Au to MoS2 improved the microtribological properties (i.e. lower friction and less wear) compared to pure MoS2 coatings. The improved microtribological properties with metal additions were attributed to an increase in the mechanical properties, decrease in adhesion, and a decrease in the interfacial shear strength. In terms of the different length scales, lower steady state friction was observed for macrotribology compared to microtribology. The higher friction at the micro-scale was explained by the greater adhesion effects and additional velocity accommodation modes (e.g. microplowing or plowing). The microplowing or plowing at the microscopic scale was attributed to the tip roughness and the inability to sustain a stable transfer film throughout the tests at high humidity. In addition, using in situ and ex situ techniques, three different stages for solid lubrication were identified based on differences in contact area, tip shapes, and environmental conditions. The first stage has been previously observed with macrotribology on MoS2 coatings at low humidity levels. The second stage, on the other hand, was observed for micro-tribology where the contact size is significantly smaller compared to stage one. The main wear mechanism is still adhesion, but there is also some micro-plowing. The final stage was observed for humid sliding in microtribology, where no transfer films were observed and therefore the main wear mechanism was plowing.Les propriétés mécaniques et tribologiques de revêtements de MoS2 pur, d'Au pur, de Au-MoS2 et de Ti-MoS2 ont été évaluées et examinées à l'échelle microscopique. Les revêtements nanocomposites étudiés contenaient 5-10 % at. de Ti et 10-90 % at. d'Au. Des tests d'usure par glissement alternatif ont été mis en œuvre, l'échelle de pression Hertzienne de contact initiale variant de 0.41 à 3.5 GPa, dans une atmosphère d'air avec deux niveaux d'humidité contrôlée (le niveau le moins élevé se situant entre 3 et 5 % HR et le plus élevé entre 30 et 40 % HR). Pour cette étude, le titane et l'or ont été choisis comme additifs métalliques pour leur influence positive sur les propriétés mécaniques des revêtements. Les comportements de friction et d'usure des revêtements à l'échelle microscopique ont été directement comparés à leurs propriétés tribologiques à l'échelle macroscopique, dont les tests étaient effectués à l'aide d'un tribomètre in situ. Des tests sclérométriques alternatifs ont été réalisés aux échelles microscopiques et macroscopiques avec des pointes de diamant sphérique (10 et 50 µm de rayon) et une pointe de saphir (ayant un rayon de 3.175 mm). La gamme de pression Hertzienne de contact utilisée à l'échelle microscopique (entre 0.41 GPa et 1.2 GPa) était très proche de celle utilisée à l'échelle macroscopique. Cependant, le diamètre de contact Hertzien initial (2*a) était très différent, soit 0.8 – 2.3 µm à l'échelle microscopique et 60 – 180 µm à l'échelle macroscopique. Les résultats montrent que l'ajout de faibles quantités de Ti ou d'Au au MoS2 améliore les propriétés micro-tribologiques (comportements à la friction et à l'usure atténués) en comparaison avec des revêtements de MoS2 pur. L'amélioration des propriétés micro-tribologiques due à l'addition de métaux a été attribuée au renforcement des propriétés mécaniques, une adhésion plus faible et une baisse des contraintes de cisaillement interfaciales. Si l'on compare des tests micro- et macro-tribologiques effectués sur des étendues de longueur variées, ces derniers étaient caractérisés par une friction en régime permanent moins élevée. Le comportement de friction plus accentué dans le cas des tests réalisés à l'échelle microscopique s'explique sur la base d'effets d'adhésion plus importants et des modes additionnels de compensation de vitesse (labourage ou micro-labourage). Les tendances au labourage ou micro-labourage observées à l'échelle microscopique ont été attribuées à la rugosité de la pointe de diamant et à la difficulté de maintenir une couche de film de transfert en place lors de tests effectués dans des conditions d'humidité élevée. L'utilisation de techniques in situ et ex situ a également permis de déterminer trois stades de lubrification solide, en se basant sur des différences observées à la zone de contact, dues aux formes des différentes pointes et aux conditions environnementales appliquées. Le premier stade, avait été identifié auparavant, lors de tests de macro-tribologie sur des revêtements de MoS2, à un niveau d'humidité faible. Par contre, le deuxième stade n'a été observé que lors de tests de micro-tribologie où la taille de la zone de contact était bien plus petite que dans le cas du premier stade. A ce stade, le mécanisme d'usure est principalement relié au comportement d'adhésion du revêtement, avec une influence possible de l'effet de micro-labourage. Le stade final de lubrification a été observé lors de tests de micro-tribologie réalisés dans des conditions d'humidité élevée et caractérisés par l'absence du film de transfert. De cette observation, il a été déduit que le principal mécanisme d'usure du film à ce stade de lubrification correspondait au labourage.
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Thorat, Ruhi P. "Opto-Electronic Properties of Self-Contacted MoS2 Monolayer Devices." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1512731597427663.
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Furlan, Kaline Pagnan. "Desenvolvimento de compósito autolubrificante de matriz ferrosa contendo MoS2." reponame:Repositório Institucional da UFSC, 2016. https://repositorio.ufsc.br/xmlui/handle/123456789/169081.
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Tese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Ciência e Engenharia de Materiais, Florianópolis, 2016.Made available in DSpace on 2016-10-11T04:03:50Z (GMT). No. of bitstreams: 1 342186.pdf: 10392257 bytes, checksum: 8c1c5b44f4e3bee87886782ff84656eb (MD5) Previous issue date: 2016
Esta tese visou o desenvolvimento de um material autolubrificante volumétrico de matriz ferrosa contendo MoS2 como elemento lubrificante majoritário. Estudos demonstram a dificuldade em se produzir este tipo de compósito, devido a reação do MoS2 com a matriz ferrosa durante a sinterização. Desta forma, a pesquisa desenvolvida nesta tese buscou soluções para evitar ou reduzir esta reação, avaliando a influência de parâmetros da matéria-prima da matriz e da fase lubrificante (tamanho de partícula, adição de outros elementos e teor de lubrificantes), bem como parâmetros de processamento (taxa de aquecimento, temperatura, formação de fase líquida, tempo de patamar e atmosfera de sinterização). Os resultados mostraram que a temperatura influiu de forma preponderante na reação, mas não a taxa de aquecimento e que o uso de um pó de Fe de menor tamanho de partícula acelera-a; o melhor desempenho está associado ao MoS2 de maior tamanho de partícula (d50=32µm) e 9% em volume é o teor limite; a adição de grafite ou h-BN retarda a reação, porém apenas compósitos com MoS2+grafite apresentaram coeficiente de atrito abaixo de 0,2 associado a um baixo desgaste. A adição de elementos de liga modificou a forma como o MoS2 reagiu com a matriz ferrosa e o desempenho tribológico do compósito, sendo que alguns apresentaram resultados similares ao Fe puro (Ni misturado e P pré-misturado), outros possuem caráter deletério (Cr e Mo misturados e Mo pré-ligado) e alguns apresentaram caráter benéfico (C e P misturados e Cr pré-ligado). É viável sinterização de amostras em temperaturas entre 800 e 850 °C, porém as abordagens visando a intensificação da densificação e propriedades mecânicas não foram bem sucedidas. Através da definição e controle da matéria prima inicial (nomeadamente tamanho de partícula da matriz e do MoS2), composição do compósito e parâmetros de processamento (temperatura, tempo e atmosfera de sinterização) foi possível a produção de materiais autolubrificantes de matriz ferrosa contendo MoS2 como elemento lubrificante majoritário que apresentam baixo coeficiente de atrito a seco (0,06-0,08) associado a uma baixa taxa de desgaste (2,0-3,5 x 10-6 mm³.N-1.m-1).
Abstract : This thesis aimed the development of a self-lubricating composite containing MoS2 dispersed in an iron matrix produced by powder metallurgy. Previous studies demonstrate that MoS2 reacts with iron matrices during sintering, making the production of Fe-MoS2 composites rather difficult. Therefore the research developed within this thesis focused on the possible solutions to avoid or reduce this reaction, evaluating the influence of raw material (particle size, amount and type of lubricants) and processing (heating rate, temperature, dwell time, liquid phase formation and atmosphere) parameters. The results have shown that temperature has a major influence on the reaction, but not the heating rate; the use of a small Fe particle size accelerates the reaction; better performance was achieved by using the d50=32µm MoS2 and 9% in volume is the limit amount; the addition of graphite or h-BN slows the reaction, but only MoS2+graphite composites presents friction coefficient below 0,2 associated with low wear rate. The addition of alloying elements modified how MoS2 interacts with the iron matrix and the composite friction coefficient, some of which had a beneficial effect (admixed C and P, and pre-alloyed Cr alloy), while others (admixed Cr and Mo, and pre-alloyed Mo alloy) are harmful. It is possible to produce iron samples by low temperature sintering (800-850 °C), however the approaches to improve densification and mechanical properties were not successful. By means of defining and adequate control of the raw material (namely particle size of matrix and lubricants), composition and processing parameters (sintering temperature, time and atmosphere) it was possible to produce self-lubricating iron based composites containing MoS2, which presented low dry friction coefficient (0,06-0,08) and low wear rate (2,0-3,5 x 10-6 mm³.N-1.m-1).
Книги з теми "MoS2 material"
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A, Ghabbour Elham, Davies Geoffrey 1942-, International Humic Substances Society, and Humic Substances Seminar (6th : 2002 : Northeastern University), eds. Humic substances: Nature's most versatile materials. New York: Taylor and Francis, 2004.
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Experimental Study of Nano-materials (Graphene, MoS2, and WSe2). [New York, N.Y.?]: [publisher not identified], 2018.
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Proell, E. R. Medicinal herbs: Mother nature's most precious gift. [United States]: Landmark Publishers, 1994.
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Flemish Public Waste Materials Association. Most relevant points from the waste materials plan 1991-1995. Mechelen, Belgium: OVAM (Flemish Public Waste Materials Association), 1991.
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Louise, Ho, ed. The most precious thing. London: Little Tiger, 2007.
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Smith, Ian, and Andrea Frangi. Use of Timber in Tall Multi-Storey Buildings. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2014. http://dx.doi.org/10.2749/sed013.
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<p>Since the dawn of civilization, timber has been a primary material for achieving great structural engineering feats. Yet during the late 19th century and most of the 20th century it lost currency as a preferred material for construction of large and tall multi-storey building superstructures. This Structural Engineering Document (SED) addresses a reawakening of interest in timber and timber-based products as primary con-struction materials for relatively tall, multi-storey buildings. Emphasis throughout is on holistically addressing various aspects of performance of complete systems, reflecting that major gaps in knowhow relate to design concepts rather than technical information about timber as a material. Special con-sideration is given to structural form, fire vulnerability, and durability aspects for attaining desired building performance over lifespans that can be centuries long.</p>
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Hori, Takashi. Gate Dielectrics and MOS ULSIs: Principles, Technologies and Applications. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997.
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Wolfgang, Skorupa, ed. Rare-earth implanted MOS devices for silicon photonics: Microstructural, electrical and optoelectronic properties. Heidelberg: Springer, 2010.
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1957-, Foster Steven, Low Dog Tieraona, and National Geographic Society (U.S.), eds. National Geographic guide to medicinal herbs: The world's most effective healing plants. Washington, D.C: National Geographic, 2010.
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Concrete planet: The strange and fascinating story of the world's most common man-made material. Amherst, N.Y: Prometheus Books, 2011.
Знайти повний текст джерелаЧастини книг з теми "MoS2 material"
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Robert, Kerlin P., Jiaoyan Li, and James D. Lee. "Multiscale Modeling of 2D Material MoS2 from Molecular Dynamics to Continuum Mechanics." In Advanced Structured Materials, 201–19. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77504-3_10.
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Borgaonkar, Avinash V., Ismail Syed, and Shirish H. Sonawane. "Effects of Lubrication on Tribological Properties of Composite MoS2-TiO2 Coating Material." In Tribological Applications of Composite Materials, 267–81. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9635-3_10.
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Borgaonkar, Avinash V., and Ismail Syed. "Effect of Temperature on the Tribological Performance of MoS2–TiO2 Coating Material." In Advances in Applied Mechanical Engineering, 611–18. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1201-8_68.
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Das, Akhila, Asha Paul, Nikhil Medhavi, Neethu T. M. Balakrishnan, M. A. Krishnan, Jou-Hyeon Ahn, Jabeen Fatima M. J., and Raghavan Prasanth. "Molybdenum Disulfide (MoS2) and Its Nanocomposites as High-Performance Electrode Material for Supercapacitors." In Metal and Metal Oxides for Energy and Electronics, 59–90. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53065-5_2.
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Bolar, Saikat, Subhasis Shit, Naresh Chandra Murmu, and Tapas Kuila. "3D Hierarchical V and N-codoped MoS2/rGO Composite as a Potential Electrode Material Towards Hydrogen Evolution Reaction in Acidic and Alkaline pH." In Tailored Functional Materials, 155–69. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2572-6_12.
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Danielsbacka, Mirkka, and Antti O. Tanskanen. "Maternal Grandmother Invests Most." In Encyclopedia of Evolutionary Psychological Science, 1–3. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-16999-6_1188-1.
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Danielsbacka, Mirkka, and Antti O. Tanskanen. "Maternal Grandmother Invests Most." In Encyclopedia of Evolutionary Psychological Science, 4917–19. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-319-19650-3_1188.
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Hu, Kunhong, Xianguo Hu, Yufu Xu, Xiaojun Sun, and Yang Jiang. "Tribology of MoS2-Based Nanocomposites." In Materials Forming, Machining and Tribology, 41–60. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33882-3_3.
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Galindo-Hernández, Félix, Ilke Arslan, José Manuel Domínguez, and Manuel Ramos. "Porosity and Fractality of MoS2 and MoS2/Co-catalytic Spheres." In Advanced Catalytic Materials: Current Status and Future Progress, 151–66. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-25993-8_7.
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Ramanathan, A. A. "MoS2 Thermoelectrics for Sustainable Energy." In The Minerals, Metals & Materials Series, 1163–71. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92381-5_110.
Повний текст джерелаТези доповідей конференцій з теми "MoS2 material"
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Wen, Y. Y., X. B. Zeng, X. X. Chen, W. Z. Wang, J. Ding, and S. E. Xu. "Synthesis of Monolayer MoS2 by CVD Approach." In 2nd Annual International Conference on Advanced Material Engineering (AME 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/ame-16.2016.167.
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LEE, JAY, and AJIT K. ROY. "Defect Properties in MoS2 Structure as 2D Material Gas Sensor." In American Society for Composites 2019. Lancaster, PA: DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/asc34/31371.
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Tan, Dezhi, Yuhei Miyauchi, and Kazunari Matsuda. "GeSe/MoS2 heterojunction diode for optoelectronic applications." In JSAP-OSA Joint Symposia. Washington, D.C.: Optica Publishing Group, 2017. http://dx.doi.org/10.1364/jsap.2017.7a_a404_8.
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Heterostructure engineering of two-dimensional (2D) layered materials offers an exciting opportunity to take advantage of each building block for fabricating new electronic and optical devices. The p-n junction diode constructed by heterostructures of 2D layered materials (e.g., MoS2/WSe2, MoS2/black phosphorus,) have been demonstrated to be excellent candidates for high-sensitive photodetectors with broad spectral response [1,2]. Recently, IV family monochalcogenides (e.g., GeS and GeSe) have been introduced as a new member of 2D material family and attracted much attention for the highly sensitive photodetector applications. The p-type semiconductor 2D GeSe has an orthorhombic structure with the band gap at around 1.1 eV. Accompanied by its strong light absorption property, the GeSe shows high-potential working as a photodetector with a broadband response from ultra-violate to near-infrared spectral regions [3]. By stacking n-type MoS2 and p-type GeSe, the formation of heterojunction diode is highly promising with unique optoelectronic properties.
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Yu, L., D. El-Damak, U. Radhakrishna, A. Zubair, D. Piedra, X. Ling, Y. Lin, et al. "High-yield large area MoS2 technology: Material, device and circuits co-optimization." In 2016 IEEE International Electron Devices Meeting (IEDM). IEEE, 2016. http://dx.doi.org/10.1109/iedm.2016.7838356.
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Sui, Wubin, Curtis Guild, Junkai He, Andrew Meguerdichian, Ran Miao, and Steven L. Suib. "An Advanced Hierarchical MoS2/Mn for High Performance Hydrogen Evolution Reaction." In 2017 International Conference on Material Science, Energy and Environmental Engineering (MSEEE 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/mseee-17.2017.66.
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Landi, Giovanni, Claudia Altavilla, Paolo Ciambelli, Heinrich C. Neitzert, Salvatore Iannace, and Andrea Sorrentino. "Preliminary investigation of polystyrene/MoS2-Oleylamine polymer composite for potential application as low-dielectric material in microelectronics." In THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937322.
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Vuddagiri, Hari Kiran, and Hota Ravi Sankar. "Estimation of tribological performance of a hybrid Al-Si/Al2O3/ MoS2 composite via Taguchi orthogonal array." In Third International Conference on Material Science, Smart Structures and Applications: (ICMSS 2020). AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0039469.
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Matsumoto, Koji, Masao Akiyama, Masahito Tagawa, and Kichiro Imagawa. "Changes in Tribological Properties of MoS2 Film Exposed to LEO on SM/SEED." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64029.
Повний текст джерелаАнотація:
Service Module / Space Environment Exposure Device (SM/SEED) is experimental system aboard International Space Station (ISS) to evaluate the degradation of various materials for space application under the Low Earth orbit (LEO) space environment. Three sets of exposure pallets of SM/SEED with the same samples have been exposed to LEO since October 2001. One of the pallets returned to Earth after about one-year exposure. A bonded molybdenum disulfide (MoS2) film was also exposed as a tested material of SM/SEED. The changes in tribological characteristics of the film were examined. And effects of ground-based irradiation with LEO environmental factors (e.g., Atomic Oxygen (AO) and Ultraviolet rays (UV)) were also evaluated. At the beginning of the test, low friction coefficient was observed both in the flight and the AO-irradiated samples. MoO3 was detected from the surface of these samples. A large amount of SiO2 was recognized from the flight sample.
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Yamasue, Kohei, and Yasuo Cho. "Unintentional Doping Effects on Atomically-Thin Nb-doped MoS2 Observed by Scanning Nonlinear Dielectric Microscopy." In ISTFA 2019. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.istfa2019p0498.
Повний текст джерелаАнотація:
Abstract Two-dimensional semiconductors such as atomically-thin MoS2 have recently gained much attention because of their superior material properties fascinating for the future electronic device applications. Here we investigate the nanoscale dominant carrier distribution on atomically-thin natural and Nbdoped MoS2 mechanically exfoliated on SiO2/Si substrates by using scanning nonlinear dielectric microscopy. We show that a few-layer natural MoS2 sample is an n-type semiconductor, as expected, but Nb-doped MoS2, normally considered as a p-type semiconductor, can unexpectedly become an n-type semiconductor due to strong unintentional electron doping.
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Lorenz, Robby, Hinnerk Hagenah, and Marion Merklein. "Influence of the coating process on the tribological conditions during cold forging with a MoS2 based lubricant." In PROCEEDINGS OF THE 21ST INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2018. Author(s), 2018. http://dx.doi.org/10.1063/1.5034867.
Повний текст джерелаЗвіти організацій з теми "MoS2 material"
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Gschwander, Stefan, Ana Lazaro, Monica Delgado, Christoph Rathgeber, Michael Brütting, Stephan Höhlein, Melissa Obermeyer, et al. Summary of Work On development and characterization of improved Materials. IEA SHC Task 58, June 2021. http://dx.doi.org/10.18777/ieashc-task58-2021-0003.
Повний текст джерелаАнотація:
As the material development is done at different institution the objective of the work was to collect the materials which are under research and development to get an overview on the most relevant properties of these materials and application which are addressed.
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Maupin, Julie, and Dr Michael Mamoun. DTPH56-06-T-0004 Plastic Pipe Failure, Risk, and Threat Analysis. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2006. http://dx.doi.org/10.55274/r0012119.
Повний текст джерелаАнотація:
Reports, publications, papers, and databases were reviewed to better define risks and threats to plastic gas distribution piping. Failure modes were described for plastic PE piping with the most significant being slow crack growth (SCG). Short-term mechanical tests such as tensile, quick burst, melt index, and density tests did not show a correlation with a material's susceptibility to SCG failure. The bend-back test was able to visually identify 1971 low-ductile inner wall materials. PENT test failure times were reported for materials manufactured during the period1972-1985. The PENT test did not show correlations with the material's susceptibility to SCG failure for these materials. Life expectancy was determined to be a key measure of the susceptibility of PE gas pipe materials to SCG field failures. Long-term hydrostatic stress-rupture data combined with the Rate Process Method or with the Bi-Directional Shift Functions predicted the remaining life expectancy of several PE materials at 60�F average field temperature under varying loading conditions. Data showed rock impingement loads and pipe squeeze-offs can result in the greatest reduction in remaining life expectancy. Lower operating field temperatures and pressures significantly increased the predicted remaining life expectancy of PE materials. Fifty-five PE pipe samples that failed in field service were examined in the laboratory to identify the root cause of the failures. Eight of the samples underwent in-depth analysis, which included density and melts index tests and differential scanning calorimetry, infrared spectroscopy, and microscopic examination of the fracture surfaces. The samples were combined with another set of additional data resulting in 45 material, 36 procedural, 12 quality control, and 7 miscellaneous failures. A separate categorization method attributed a total of 321 failures to their respective pipe/component, with most occurring at joints. RCP in large diameter PE materials was investigated through laboratory testing. Critical pressure was determined for 6 pipe materials. The critical temperature was determined for 3 materials.
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Morrison, K. G. PR-214-9109-R01 Application of Pulsed Gas Metal ARC Welding to Pipeline Construction. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), November 1992. http://dx.doi.org/10.55274/r0011832.
Повний текст джерелаАнотація:
Evaluates the use of high strength micro-alloyed steels in pipeline construction for the potential savings in material, materials handling, and welding construction costs. Pulsed- Gas Metal Arc Welding (P-GMAW) is considered the most appropriate welding process to join these materials since high quality, low hydrogen welds with excellent mechanical properties are possible.
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Baldwin, Richard. PR-015-084508-R01 Contaminants in Sales Gas Pipelines Sources Removal and Treatment. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), September 2010. http://dx.doi.org/10.55274/r0010029.
Повний текст джерелаАнотація:
The objective of this project is to provide information about a problem material found in gas pipelines called "black powder". It is a mixture or a chemical compound of iron sulfides, iron oxides, dirt, sand, salts, chlorides, water, glycols, hydrocarbons and compressor oils, mill scale, or other materials. The most common constituents, iron compounds of sulfur or oxygen, are corrosion products. In addition to chemical formation, black powder can be formed by microbes normally found in gas pipelines. This material causes machinery, measurement, and pipeline maintenance problems. This research investigates the forms of iron sulfides, their characteristics, and methods of formation and whether the molecular form can be an indicator of the source of the material. A sampling protocol was developed for proper collection of materials for analysis. Seventeen corrosion samples were collected and analyzed for material constituents and microbial content. The results of this testing were anonymously tabulated in a database. Other tasks in this project include guidelines for removal, handling, and disposal of the material. It discusses symptomatic versus root cause treatments for the prevention and control of black powder, and the corporate culture necessary to manage the problem. It presents recently developed technologies for cleaning or treating a pipeline containing black powder, such as cleaning and anti-microbial agents containing THPS which dissolve iron sulfides, and the use of magnetic filtration. The final task describes concepts for identifying the location of black powder in an operating pipeline and places to look and methods to use to best determine the distribution of the material.
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McKinnon, Mark, and Daniel Madryzkowski. Literature Review to Support the Development of a Database of Contemporary Material Properties for Fire Investigation Analysis. UL Firefighter Safety Research Institute, June 2020. http://dx.doi.org/10.54206/102376/wmah2173.
Повний текст джерелаАнотація:
The NIJ Technology Working Group’s Operational Requirements (TWG ORs) for Fire and Arson Investigation have included several scientific research needs that require knowledge of the thermophysical properties of materials that are common in the built environment, and therefore likely to be involved in a fire scene. The specific areas of research include: adequate materials property data inputs for accurate computer models, understanding the effect of materials properties on the development and interpretation of fire patterns, and evaluation of incident heat flux profiles to walls and neighboring items in support of fire model validation. These topics certainly address, in a concise way, many of the gaps that limit the analysis capability of fire investigators and engineers. Each of the three aforementioned research topics rely, in part, on accurate knowledge of the physical conditions of a material prior to the fire, how the material will respond to the exposure of heat, and how it will perform once it has ignited. This general information is required to visually assess a fire scene. The same information is needed by investigators to estimate the evolution and consequences of a fire incident using a computer model. Data sources that are currently most commonly used to determine the required properties and model inputs are outdated and incomplete. This report includes the literature review used to provide a technical approach to developing a materials database for use in fire investigations and computational fire models. A summary of the input from the project technical panel is presented which guided the initial selection of materials to be included in the database as well as the selection of test measurements.
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Thembeka Ncube, Ayanda, and Antonio Bobet. Use of Recycled Asphalt. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317316.
Повний текст джерелаАнотація:
The term Reclaimed Asphalt Pavement (RAP) is used to designate a material obtained from the removal of pavement materials. RAP is used across the US in multiple applications, largely on asphalt pavement layers. RAP can be described as a uniform granular non-plastic material, with a very low percentage of fines. It is formed by aggregate coated with a thin layer of asphalt. It is often used mixed with other granular materials. The addition of RAP to aggregates decreases the maximum dry unit weight of the mixture and decreases the optimum water content. It also increases the Resilient Modulus of the blend but decreases permeability. RAP can be used safely, as it does not pose any environmental concerns. The most important disadvantage of RAP is that it displays significant creep. It seems that this is caused by the presence of the asphaltic layer coating the aggregate. Creep increases with pressure and with temperature and decreases with the degree of compaction. Creep can be mitigated by either blending RAP with aggregate or by stabilization with chemical compounds. Fly ash and cement have shown to decrease, albeit not eliminate, the amount of creep. Mechanical stabilizing agents such as geotextiles may also be used.
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Barkan, Terrance. The Role of Graphene in Achieving e-Mobility in Aerospace Applications. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, December 2022. http://dx.doi.org/10.4271/epr2022030.
Повний текст джерелаАнотація:
<div class="section abstract"><div class="htmlview paragraph">Advanced two-dimensional (2D) materials discovered in the last two decades are now being produced at scale and are contributing to a wide range of performance enhancements in engineering applications. The most well-known of these novel materials is graphene, a nearly transparent nanomaterial comprising a single layer of bonded carbon atoms. In relative terms, it has the highest level of heat and electrical conductivity, protects against ultraviolet rays, and is strongest material ever measured. These properties have made graphene an attractive potential material for a variety of applications, particularly for transportation related uses, and especially for aerospace engineering. </div><div class="htmlview paragraph"><b>The Role of Graphene in Achieving e-Mobility in Aerospace Applications</b> reviews the current state of graphene-related aerospace applications and identifies the technological challenges facing engineers that look to benefit from graphene’s attractive properties.</div><div class="htmlview paragraph"><a href="https://www.sae.org/publications/edge-research-reports" target="_blank">Click here to access the full SAE EDGE</a><sup>TM</sup><a href="https://www.sae.org/publications/edge-research-reports" target="_blank"> Research Report portfolio.</a></div></div>
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Brown, Jasen, Robert Davinroy, Ivan Nguyen, Aron Rhoads, Nathan Lovelace, Emily Russ, and Jessamin Straub. Tombigbee River : River Miles 81.0-76.0 sediment management study. Engineer Research and Development Center (U.S.), April 2022. http://dx.doi.org/10.21079/11681/43942.
Повний текст джерелаАнотація:
The US Army Corps of Engineers, St. Louis District, Applied River Engineering Center (AREC), in cooperation with the Operations Branch of the Mobile District, conducted a sediment management study of the Sunflower Bend reach of the Tombigbee River, between River Miles 81.0 and 76.0, near Jackson, AL. The objective of the study was to look at sediment management alternatives to alleviate or eliminate repetitive maintenance dredging. These alternatives involved various river engineering measures including dikes, weirs, channel armoring, disposal armoring, and combinations thereof. A physical Hydraulic Sediment Response model was used to examine the sediment response resulting from these alternatives. During model testing, and after discussions with AREC and Mobile Operations Division staff, a second objective was established to define existing non-erodible bed materials that were located throughout the reach. This was conducted to examine the merits of strategically removing these erosion resistant materials in the river as an additional dredging/excavation alternative. The most favorable alternatives involved removing bedload sand and consolidated clay material from between River Miles 79.1 and 78.0 to improve navigation.
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Rudland. L52245 Improvements to the Two Curve Ductile Fracture Model - Soil-Elastic and Plastic Contributions. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), May 2007. http://dx.doi.org/10.55274/r0010625.
Повний текст джерелаАнотація:
The most commonly used fracture analyses procedure for the prediction of minimum arrest toughness and fracture speed for axially running cracks in line pipe materials for natural gas transmission pipeline applications is the Battelle Two-Curve approach. This analysis procedure incorporates the gas-decompression behavior with the fracture toughness of the pipe material to predict the minimum Charpy energy required for crack arrest. For this model, the effect of backfill on the propagating crack fracture speeds is lumped into one empirically based �backfill coefficient,� which does not distinguish different soil types or strengths. This report provides a better understanding of soil behavior and its affect on the fracture speed of running axial flaws in buried line pipe materials. The results from this program are combined with other full-scale experimental data in developing a modification to the treatment of backfill in the Battelle Two-Curve approach for calculating minimum arrest toughness. This first major improvement to the Battelle Two-Curve approach is incorporated into a computer code called PIPE-DFRAC.
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Kim, Changmo, Ghazan Khan, Brent Nguyen, and Emily L. Hoang. Development of a Statistical Model to Predict Materials’ Unit Prices for Future Maintenance and Rehabilitation in Highway Life Cycle Cost Analysis. Mineta Transportation Institute, December 2020. http://dx.doi.org/10.31979/mti.2020.1806.
Повний текст джерелаАнотація:
The main objectives of this study are to investigate the trends in primary pavement materials’ unit price over time and to develop statistical models and guidelines for using predictive unit prices of pavement materials instead of uniform unit prices in life cycle cost analysis (LCCA) for future maintenance and rehabilitation (M&R) projects. Various socio-economic data were collected for the past 20 years (1997–2018) in California, including oil price, population, government expenditure in transportation, vehicle registration, and other key variables, in order to identify factors affecting pavement materials’ unit price. Additionally, the unit price records of the popular pavement materials were categorized by project size (small, medium, large, and extra-large). The critical variables were chosen after identifying their correlations, and the future values of each variable were predicted through time-series analysis. Multiple regression models using selected socio-economic variables were developed to predict the future values of pavement materials’ unit price. A case study was used to compare the results between the uniform unit prices in the current LCCA procedures and the unit prices predicted in this study. In LCCA, long-term prediction involves uncertainties due to unexpected economic trends and industrial demand and supply conditions. Economic recessions and a global pandemic are examples of unexpected events which can have a significant influence on variations in material unit prices and project costs. Nevertheless, the data-driven scientific approach as described in this research reduces risk caused by such uncertainties and enables reasonable predictions for the future. The statistical models developed to predict the future unit prices of the pavement materials through this research can be implemented to enhance the current LCCA procedure and predict more realistic unit prices and project costs for the future M&R activities, thus promoting the most cost-effective alternative in LCCA.