Дисертації з теми "MoS2 nanosheets"
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Feng, Xinliang, Jian Zhang, Tao Wang, Pan Liu, Shaohua Liu, Renhao Dong, Xiaodong Zhuang, and Mingwei Chen. "Engineering water dissociation sites in MoS2 nanosheets for accelerated electrocatalytic hydrogen production." Royal Society of Chemistry, 2016. https://tud.qucosa.de/id/qucosa%3A30309.
Повний текст джерелаFeng, Xinliang, Jian Zhang, Tao Wang, Pan Liu, Shaohua Liu, Renhao Dong, Xiaodong Zhuang, and Mingwei Chen. "Engineering water dissociation sites in MoS2 nanosheets for accelerated electrocatalytic hydrogen production." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-224286.
Повний текст джерелаRies, Lucie. "Functionalized two-dimensional (2D) MoS2 nanosheets as building blocks for water purification membranes." Thesis, Montpellier, Ecole nationale supérieure de chimie, 2019. http://www.theses.fr/2019ENCM0009.
Повний текст джерелаMembrane separation technology plays an important role in various fields including water treatment, chemicals and gas separation for numerous industrial fields, and food processing. There has been a renewed focus on two-dimensional(2D) materials for membrane application since their atomic thicknessand confined interlayer spacing could theoretically lead to enhanced separative performances. Either the single nanosheets themselves, or the stackingof multiple sheets can form selective membranes. The multilayer assembly of single nanosheets – forming nanolaminate membranes – creates 2D capillaries(or nanochannels) that can efficiently sieve chemical species depending ontheir size.Recent examples have been reported in the literature demonstrating the potential of 2D materials as multi- or single-layer membranes for molecular sieving(222; 260; 466; 204), gas separation (219; 246; 190), energy harvesting (467)and water desalination (198; 194).Among the different building blocks of nanolaminate membranes made of two-dimensional materials (2D), graphene oxide (GO) has been studied as a candidate for molecular sieving via size-limited diffusion in the 2D capillaries (222). Unfortunately the high hydrophilicity of GO nanosheets makes GO membranes unstable in water, while the poor control of the capillary width between the nanosheets limits the water permeance of the membranes. Other 2D materials such as exfoliated nanosheets of transition metal dichalcogenides (TMDs)constitute attractive platforms for the realization of nanolaminate membranes.Recent works carried out on nanolaminate membranes made of molybdenum disulfide (MoS2) have demonstrated improved stability (3). Within this thesis we have studied the performance of a novel type of MoS2 nanolaminate membranes with well-controlled surface chemistry of the nanosheets (14). Inorder to assess the role of surface chemistry, we explored the impact of covalent functionalization on molecular sieving toward water purification (i.e. desalination and micropollutant removal) (14). Our results open novel directions to finely tune the sieving behavior of membranes based on 2D materials
Al-Dulaimi, Naktal. "Rhenium disulfide and rhenium-doped MoS2 thin films from single source precursors." Thesis, University of Manchester, 2018. https://www.research.manchester.ac.uk/portal/en/theses/rhenium-disulfide-and-rheniumdoped-mos2-thin-films-from-single-source-precursors(16f715f7-392a-43f5-b201-64106517d319).html.
Повний текст джерелаGaben, Loic. "Fabrication et caractérisation de transistors MOS à base de nanofils de silicium empilés et à grille enrobante réalisés par approche Gate-Last pour les noeuds technologiques sub-7 nm." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT095/document.
Повний текст джерелаThe future of the transistors currently used in Microelectronics is still uncertain: shrinking these devices while increasing their performances always remains a challenge. In this thesis, stacked nanowire transistors are studied, fabricated and optimized. This architecture embeds gate all around which is the ultimate solution for concentrating always more current within a smaller device. Simulations have shown that silicon nanosheets provide an optimal utilization of the space with providing increased performances over the other technologies. Crucial process steps have also been identified. Subsequently, two process flows have been suggested for the fabrication of SNWFETs. The first approach consists in minimizing the number of variations from processes already in mass production. The second alternative has potentially better performances but its development is more challenging. Finally, the fabricated transistors have shown improved performances over state-of-the-art especially due to mechanical stress induced for improving electric transport
Sholeh, Mohammad, and 莫哈末. "Preparation and Characterization of Few-layer MoS2 Nanosheets." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/04439932220963451432.
Повний текст джерела國立臺灣科技大學
化學工程系
103
Exfoliation of bulk MoS2 via Li intercalation is an attractive route to large-scale preparation of MoS2 few-layers and it can be used to realize their unique properties in practical applications. In generally, solution-based exfoliation of layered materials results in flakes with lateral sizes of one micron or less on average. In this report, we performed the various preparations using a Li-intercalation method at room temperature to prepare MoS2 few-layers with various flake sizes according to dynamic light scattering (DLS) analysis. MoS2 few-layers with particle sizes ranging 85 to 145 nm are reported. We also characterize the few-layer MoS2 nanosheets by various microscopic and spectroscopic techniques.
Mascarenhas, Xavier Mongiardim Pinto de. "MoS2 nanosheets as interlayer in Li-S batteries." Master's thesis, 2020. http://hdl.handle.net/10362/110347.
Повний текст джерелаGupta, Amit. "Aqueous and Non- aqueous dispersions of MoS2 Nanosheets." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5352.
Повний текст джерелаSINGH, MANJOT. "Study of biological interactions between water dispersed 2D-MoS2 nanosheets and live matter." Tesi di dottorato, 2020. http://www.fedoa.unina.it/13168/1/ManjotSingh32.pdf.
Повний текст джерелаWu, Man-Jyun, and 吳曼君. "Functionalization of MoS2 nanosheets with aptamer as FRET-based nanoprobe for biomolecular detection and cellular imaging." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6b4mnb.
Повний текст джерела國立中山大學
化學系研究所
107
In this study, we propose that mono-layered MoS2 nanosheets (M-MoS2 NSs) were proven to be impulsively adsorb on thiolated DNA molucules, due to the existence of sulfur vacancy sites on the surface of MoS2, based on that ssDNA-capped M-MoS2 NSs are customized to detect perfectly matched target DNA that is hybridized with the complementary ssDNA, MoS2 NSs with thiolated DNA molecules can be further accomplished via a one-step process under the mild buffer and salt-free conditions. In addition to, the filling of thiolated DNA molecules in sulfur vacancy sites is thermodynamically favorable. Inspired by these findings, we reason that sulfur vacancies of exfoliated MoS2 NSs could directly bind to thiol-terminated complementary oligonucleotides that are designed to bind with fluorescence resonance energy transfer (FRET)-based DNA probes. To further improvement, liberated reporter flares form hairpin-shaped structures, causing quite high FRET efficiency, these flare/ssDNA-capped M-MoS2 NSs offered comparable sensitivity, good selectivity, and high-precision to quantification of potassium (K+) ion and also Adenosine Triphosphate (ATP). In addition to, M-MoS2 NSs were used as a vector to modify the thiolated oligonucleotide (cDNA-SH) on a nanosheet by ligand conjugation, and the aptamer (D-Apt-A) partially complementary to the cDNA-SH sequence. The end group-modified fluorescent probe (FAM and TAMRA), which are the donor (D) and acceptor (A) of Förster resonance energy transfer (FRET), respectively. In the presence of the analyte, D-Apt-A would be facilitate to capture and carry out the double-strand hybridization and then detach from the surface anchored cDNA of M-MoS2 NSs. The as-prepared flare/ssDNA-capped M-MoS2 NSs and G4 flare/ssDNA- and also Apt flare/ssDNA were shown to have practical applications in the quantitative determination of K+ in human plasma and ATP in erythrocytes as well as ratio metric fluorescent imaging of K+- and ATP-related reactions and TK1 mRNA in living cells along with real samples.
Dang, Van Thanh, and 鄧文成. "Production of two-dimensional layeredmaterials-graphite oxide and grapheneby plasma electrochemistry an¬d MoS2 nanosheets by quenching method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/cwpfbr.
Повний текст джерела國立交通大學
材料科學與工程學系所
102
The purpose of this work is to find out new approaches for one-pot synthesis of graphite oxide and graphene by plasma electrochemical exfoliation of graphite in a basic electrolyte solution in a short-reaction time with regards of environmental friendliness, energy/time saving, and low cost. First of all, we adopted a highly efficient cathodic plasma (CP) process in which the vapor plasma envelope calorific effect provides instant oxidation and expansion of graphite for producing plasma-expanded graphite oxides (PEGOs) from recycled graphite electrodes (GEs) or high purity graphite (HG), within a reaction time of 10 min without the need for strong oxidants or concentrated acids. X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectroscopy confirmed the dramatic structural change from GEs or HG to graphite oxides after the CP process. Furthermore, scanning electron microscopy and transmission electron microscopy revealed that the graphite oxide possessed a spheroidal morphology, with dimensions of 1–3 μm, as a result of melting and subsequent quenching during the plasma electrolysis process. We obtained a stable, homogeneous dispersion of PEGOs in N-methyl-2-pyrrolidone after sonication and filtering of the centrifuged PEGOs. We used these spheroidal graphite oxide particles as effective adsorbents for the removal of pollutants (e.g., Methylene Blue) from aqueous solutions. These PEGOs also served as good precursors for the preparation of graphite nanopletets. iv Sequently, we have demonstrated a new and highly efficient plasma-assisted electrochemical exfoliation method, involving a plasma-generated graphite cathode and a graphite anode, for the production of graphene sheets from electrodes in a basic electrolyte solution in a short reaction time. The AFM images revealed a lateral dimension of approximately 0.5–2.5 μm and a thickness of approximately 2.5 nm, corresponding to approximately seven layers of graphene, based on an interlayer spacing of 0.34 nm. Additively, the influence of electrolytic concentration on morphological and structural properties of plasmaelectrochemically exfoliated graphene is investigated and presented. Finally, we developed an efficient solution-based method for the production of few-layer MoS2 nanosheets through exfoliation of bulk MoS2 compounds that were subject to quenching in liquid N2 and subsequent ultrasonication. AFM images of individual nanosheets revealed that the thickness varied from 1.5 to 3.5 nm and the lateral dimensions from 0.5 to 3.5 μm.
Zhang, Z., W. Li, M. F. Yuen, T.-W. Ng, Y. Tang, C.-S. Lee, Xianfeng Chen, and W. Zhang. "Hierarchical composite structure of few-layers MoS2 nanosheets supported by vertical graphene on carbon cloth for high-performance hydrogen evolution reaction." 2015. http://hdl.handle.net/10454/9428.
Повний текст джерелаHere we report a hierarchical composite structure composed of few-layers molybdenum disulfide nanosheets supported by vertical graphene on conductive carbon cloth (MDNS/VG/CC) for high-performance electrochemical hydrogen evolution reaction (HER). In the fabrication, 3D vertical graphene is first prepared on carbon cloth by a micro-wave plasma enhanced chemical vapor deposition (MPCVD) and then few-layers MoS2 nanosheets are in-situ synthesized on the surface of the vertical graphene through a simple hydrothermal reaction. This integrated catalyst exhibits an excellent HER electrocatalytic activity including an onset potential of 50 mV, an overpotential at 10 mA cm(-2) (eta(10)) of 78 mV, a Tafel slop of 53 mV dec(-1), and an excellent cycling stability in acid solution. The excellent catalytic performance can be ascribed to the abundant active edges provided by the vertical MoS2 nanosheets, as well as the effective electron transport route provided by the graphene arrays on the conductive substrate. Moreover, the vertical graphene offers robust anchor sites for MoS2 nanosheets and appropriate intervals for electrolyte infiltration. This not only benefits hydrogen convection and release but also avoids the damaging or restacking of catalyst in electrochemical processes.
This work was financially supported by the National Natural Science Foundation of China (Grant nos. 61176007, 51372213, and 51402343).
WANG, YI-MIN, and 王奕閔. "Synthesis and Applications of Vertically Grown MoS2/MoO2 Nanosheet Composite Structures." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/vg7286.
Повний текст джерела國立臺北科技大學
製造科技研究所
107
In this study, a horizontal furnace tube was used to synthesis vertically grown MoS2 nanosheets on SiO2 substrate by chemical vapor deposition. In the first part, the samples were synthesized by changing the ratios of different MoO3 powder to sulfur powder with the same total amount in 1 g and denoted as 1:4, 1:8, 1:16, 1:18, 1:20, 1:24 and 1:32, respectively. It was found that the MoS2 was been synthesized with smaller proportion (1:16 ~ 1:32) accompanied with minority of bulk-like MoO3 and with larger proportion (1:4 and 1:8) accompanied with majority of normal MoO2 during the growth process, respectively. These three parameters of 1:16, 1:18 and 1:20 have less bulk-like MoO2 and the highest structural height, so it is the optimal parameter from 1:16 to 1:20. Furthermore, when the ratio of MoO3 to S was increased to 1:32, the phase and the height of MoS2 nanosheets are highly reduced. In addition, after optimizing these three proportion of MoO3 to S, the total amounts of powder have been tuned from 1 to 2 g. The results show that the diffraction peak and height of MoS2 nanosheet were increased with increasing the total amount of powder. However, when the total amount up to 2 g, the bulk-like MoO2 will be observed in the sample with every proportional parameter. Therefore, the total amount of 1.7 g was the optimal parameter due to the highest nanosheet structure comparing to the others. The crystal structure and surface morphology of the samples which in ratio of 1:16, 1:18, and 1:20 with total amount of 1.7 g were demonstrated by XRD, Raman and SEM, respectively. Finally, ontact angle (CA) measurement, UV-VIS spectra and photodetector systems were employed to identify the surface wettability, water purification and photodetector capabilities, respectively.
Ali, Rajab S. K. "Engineering of Nanomaterials: Application in Antibacterial Activity, Bio-Analyte Detection and Environmental Remediation." Thesis, 2023. https://etd.iisc.ac.in/handle/2005/6071.
Повний текст джерелаChiou, Tz-Chen, and 邱子宸. "Fabrication and characterization of monolayer MoS2 nanosheet transistor for VLSI applications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f3zq2t.
Повний текст джерелаChen, Jian-Ming, and 陳建銘. "Hydrothermal synthesis of layered MoSe2 nanosheets and their use in supercapacitor." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/n9k2zf.
Повний текст джерела國立高雄應用科技大學
化學工程與材料工程系博碩士班
104
In this study, molybdenum diselenide (MoSe2) with nano-layered structure was synthesized by a hydrothermal method. The process parameters such as reaction temperature and annealing temperature were investigated for their effects on the crystallinity, morphology of the products, and their related electrical characteristics. X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), high magnification transmission electron microscope (HR-TEM), and Raman spectroscopy (Raman) were used to analyze its crystallinity and morphology of MoSe2. The electrical characteristics was done by cyclic voltammetry and charge/discharge test. It was found that samples only being reacted in an autoclave of three different temperature, i.e., 180, 200 or 220 ℃, without further annealing exhibited amorphous structures. After further annealing, MoSe2 exhibited crystalline structure. MoSe2 annealing 400~700 ℃, are nano-particles by FE-SEM. A flower like morphology was noted in the samples of being annealed at 400 ℃. A layered structure of MoSe2 was observed by HR-TEM and proved in Raman spectroscopy. Electrochemical tests found MoSe2 exhibit pseudo-capacitance reaction. The capacitance value of 206 F/g was obtained from the charging and discharging experiments. The data proved that MoSe2 electrodes have good electrochemical characteristics.