Дисертації з теми "TMDC materials"
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Plumadore, Ryan. "Study of Two Dimensional Materials by Scanning Probe Microscopy." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/38637.
Повний текст джерелаBarros, Barbosa Juliana. "Matériaux 2D TMDC pour la génération d'hydrogène par photo-décomposition de l'eau." Thesis, Toulouse 3, 2020. http://www.theses.fr/2020TOU30108.
Повний текст джерелаCollecting and storing solar energy in chemical energy is a highly desirable approach to solve energy challenge. The great potential of a photoelectrochemical cell technology combines the harvesting of solar energy with the water splitting into a single device. 2D semiconducting nanosheets of Transition Metal Di-Chalcogenides (TMDC) are seen as an attractive material to design an efficient photocatalyst for the conversion of solar energy into hydrogen. Despite the unique optoelectronic properties of the TMDCs, the passivation of surface defects in high concentration is a remaining challenge for the development of this class of materials. In this context, the present work has aimed the elaboration of thin 2D TMDC photocatalyst for solar water splitting. The development of high performance photocatalysts was evaluated following two main axis. A first strategy consists in the surface defects passivation of 2D p-WSe2 nanosheets using Mo-S complexes to decrease the photogenerated charge carrier recombination and improve photocatalytic activity. We demonstrated these Mo thio and oxo-thio- molecular complexes films as an ideal class of catalysts, well-suited to functionalize 2D materials since they are stable in aqueous environments, cheap and environmentally benign. Current densities of -2 mA cm-2 at -0.2 V vs NHE electrode were obtained for the new p-WSe2/MoxSy photocathode. Besides developing high electro-catalytic activity, the Mo complexes films were shown to display ability to heal surface defects. The respective contributions in catalytic and healing effects observed experimentally for the various molecular Mo complexes involved strong adsorption on point defects of the 2D WSe2 substrate of Mo complexes such as (MoS4)2-, (MoOS3)2-and (Mo2S6O2)2-. The Mo complexes films spontaneously formed at well-defined pH were demonstrated to present n-semi-conducting behaviour and band engineering formed with p-WSe2 showed to be suitable for ensuring charge separation and efficient migration of the photo-induced electrons for the Hydrogen Evolution Reaction, thus representing an example of multicomponent passivation layer exhibiting multiple properties. A second strategy focus in the nanostructure optimization of WSe2 with high specific surface area and pore walls composed of few layers. Nanostructured WSe2 films of high surface area and good charge carrier collection were obtained by co-assembling WSe2 nanosheets and reduced graphene oxide (rGO) nanosheets with an optimal rGO/WSe2 nanosheet ratio. After deposition of co-catalyst thin layer, the new layered nanojunctions of rGO-WSe2/MoxSy exhibited photocurrents up to -5 mA cm-2 at -0.2V vs NHE. Incident-photon-to-current efficiency conversion of 10% were achieved for WSe2 nanoflakes of 70 nm thickness in presence of rGO and MoxSy co-catalyst.[...]
Barrios, pérez María. "Design and computer simulations of 2D MeX2 solid-state nanopores for DNA and protein detection analysis." Thesis, Bourgogne Franche-Comté, 2020. http://www.theses.fr/2020UBFCK003.
Повний текст джерелаSolid-state nanopores (SSN) have emerged as versatile devices for biomolecule analysis. One of the most promising applications of SSN is DNA and protein sequencing, at a low cost and faster than the current standard methods. SSN sequencing is based on the measurement of ionic current variations when a biomolecule embedded in electrolyte is driven through a nanopore under an applied electric potential. As a biomolecule translocates through the nanopore, it occupies the pore volume and blocks the passage of ions. Hence, ultrafast monitoring of ionic flow during the passage of a biomolecule yields information about its structure and chemical properties. The size of the sensing region in SSN is determined by the size and thickness of the pore membrane. Therefore, two-dimensional (2D) transition metal dichalcogenides such as molybdenum disulfide (MoS2) arise as great candidates for SSN applications as an alternative to graphene. In the present work, we investigated the feasibility of using MoS2 nanopores for protein sequencing from all-atom molecular dynamics (MD) simulations. First, we studied the ionic conductance of MoS2 nanoporous membranes by characterizing the KCl electrolyte conductivity through MoS2 nanopores with diameters ranging from 1.0 to 5.0 nm and membranes from single to five-layers. Using MD simulations, we showed the failure of the usual macroscopic model of conductance for the nanoporous membranes with the smallest diameters and developed a modified model which proves usefulness to interpret experimental data. Second, we investigated the threading and translocation of individual lysine residues and a model protein with poly-lysine tags through MoS2 nanopores under the application of an electric potential. A proof-of principle technique based on the use of positively or negatively charged amino acids for protein translocation was proposed to promote the entrance of proteins through SSN in experiments. By analyzing the current-voltage curves simulated, we established the relationship between the translocation sequence events through the nanopores observed at the atomic scale in MD simulations, and the computed current fluctuations. Finally, experimental evidence of ionic conductance measurements in sub-nanometer (sub-nm) pores made of atomic defects has been recently reported. To give a better insight of the ionic transport through atomic scale pores, we performed MD simulations of sub-nm defect MoS2 pores using the reactive potential ReaxFF. Here, we characterized the variations of the atomic structure of the pores in vacuum and then we investigated the ionic conductance performance of one of the MoS2 defect pore membranes. ReaxFF potential was also useful to investigate the possible reactivity of MoS2 defect pore membranes with ethanol molecules. In addition, these simulations might provide a better understanding of the experimental setup of DNA sequencing, in which ethanol plays an unknown role in the sample preparation of the SSN
Zheng, Husong. "STM Study of Interfaces and Defects in 2D Materials." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97440.
Повний текст джерелаDoctor of Philosophy
Since the discovery of graphene in 2004, two-dimensional (2D) materials have attracted more and more attentions. When the thickness of a layered material thinned to one or few atoms, it shows interesting properties different from its bulk phase. Due to the reduced dimensionality, interfaces and defects in 2D materials will significantly affect the electronic property and chemical activity. However, such nanometer scale features are several orders of magnitude smaller than the wavelength of visible light, which is the limit of resolution for optical microscope. Scanning tunneling microscope (STM) is widely used in study of 2D materials not only because it can provide the topography and local electronic information at atomic scale, but also because of the possibility of directly fabricate atomic scale structure on the surface. The first part of the thesis focuses on the synthesis of 2D TiSe2 with chemical vapor transport (CVT). TiSe2 belongs to the transition metal dichalcogenides (TMDCs) family, showing a sandwiched layered structure. When the temperature goes down to 200K, a 2 × 2 superlattice called charge density wave (CDW) will show up, which is clearly observed in our STM images. The second part of the thesis focuses on monolayer vacancy islands growing on TiSe2 surface controlled by electrical stressing. During continuous STM scanning, we have observed nonlinear area growth of the vacancy islands. The shape of those islands transfers from triangular to hexagonal. We successfully simulated such growth using phase-field modeling and first-principles calculations. The results could be potentially important for device reliability in systems containing ultrathin TMDCs and related 2D materials subject to electrical stressing. The third part of the thesis focuses on defects in 2D PtSe2. We observed five types of distinct defects in our STM topography images. By comparing them with DFT-calculated simulation images, we identified the types and characteristics of these defects. Our findings would provide critical insight into tuning of carrier mobility, charge carrier relaxation, and electron-hole recombination rates by defect engineering in few-layer 1T-PtSe2 and other related 2D materials.
De, Sanctis Adolfo. "Manipulating light in two-dimensional layered materials." Thesis, University of Exeter, 2016. http://hdl.handle.net/10871/27414.
Повний текст джерелаChoukroun, Jean. "Theoretical sStudy of In-plane Heterojunctions of Transition-metal Dichalcogenides and their Applications for Low-power Transistors." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS557/document.
Повний текст джерелаNowadays, microprocessors can contain tens of billions of transistors and as a result, heat dissipation and its impact on device performance has increasingly become a hindrance to further scaling. Due to their working mechanism, the power supply of MOSFETs cannot be reduced without deteriorating overall performance, and Si-MOSFETs scaling therefore seems to be reaching its end. New architectures such as the TFET, which can perform at low supply voltages thanks to its reliance on band-to-band tunneling, and new materials could solve this issue. Transition metal dichalcogenide monolayers (TMDs) are 2D semiconductors with direct band gaps ranging from 1 to 2 eV, and therefore hold potential in electronics and photonics. Moreover, when under appropriate strains, their band alignment can result in broken-gap configurations which can circumvent the traditionally low currents observed in TFETs due to the tunneling mechanism they rely upon. In this work, in-plane TMD heterojunctions are investigated using an atomistic tight-binding approach, two of which lead to a broken-gap configuration (MoTe2/MoS2 and WTe2/MoS2). The potential of these heterojunctions for use in tunnel field-effect transistors (TFETs) is evaluated via quantum transport computations based on an atomistic tight-binding model and the non-equilibrium Green’s function theory. Both p-type and n-type TFETs based on these in-plane TMD heterojunctions are shownto yield high ON currents (ION > 103 µA/µm) and extremely low subthreshold swings (SS < 5 mV/dec) at low supply voltages (VDD = 0.3 V). Innovative device architectures allowed by the 2D nature of these materials are also proposed, and shown to enhance performance even further
Young, Justin R. "Synthesis and Characterization of Novel Two-Dimensional Materials." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1468925594.
Повний текст джерелаMa, Yujing. "Two Dimensional Layered Materials and Heterostructures, a Surface Science Investigation and Characterization." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/7057.
Повний текст джерелаZheng, Shan. "Two-dimensional electronics : from material synthesis to device applications." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/284930.
Повний текст джерелаHagerty, Phillip. "Physical Vapor Deposition of Materials for Flexible Two Dimensional Electronic Devices." University of Dayton / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1460739765.
Повний текст джерелаTartari, Enrico. "Study of localized defect-bound excitonic transitions in TMD-WSe2 monolayers and evanescent coupling to tapered optical nanofibers." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/22128/.
Повний текст джерелаPark, Juhong. "Fabrication of Large-Scale and Thickness-Modulated Two-Dimensional Transition Metal Dichalcogenides [2D TMDs] Nanolayers." Thesis, University of North Texas, 2019. https://digital.library.unt.edu/ark:/67531/metadc1505271/.
Повний текст джерелаAllam, Lévi. "Etude de la diffusion unidimensionnelle dans les chaines finies : application au tmmc-cd." Toulouse 3, 1987. http://www.theses.fr/1987TOU30063.
Повний текст джерелаBeyer, Griffin Joseph. "Large Area 2D Electronic Molecular Sensor Arrays via Photonic Annealing of Amorphous Sputtered Mos2." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1582624657416084.
Повний текст джерелаTenasini, Giulia. "Quantum transport in monolayer WTe2." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14897/.
Повний текст джерелаTěšík, Jan. "Luminiscence polovodičů studovaná rastrovací optickou mikroskopií v blízkém poli." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-320110.
Повний текст джерелаBandyopadhyay, Avra Sankar. "Light Matter Interactions in Two-Dimensional Semiconducting Tungsten Diselenide for Next Generation Quantum-Based Optoelectronic Devices." Thesis, University of North Texas, 2020. https://digital.library.unt.edu/ark:/67531/metadc1752376/.
Повний текст джерелаForsberg, Viviane. "Liquid Exfoliation of Molybdenum Disulfide for Inkjet Printing." Licentiate thesis, Mittuniversitetet, Avdelningen för naturvetenskap, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-29181.
Повний текст джерелаSedan upptäckten av grafen har mycket arbete lagts på framställning och produktion av 2D-material. En viktig uppgift har varit att ta fram skalbara metoder för produktion av högkvalitativa nanosheets via exfoliering. Den mest lovande skalbarametoden hittills har varit vätskebaserad exfoliering av nanosheets i lösningsmedel. Tunna filmer av nanosheets i dispersion kan anpassas med hjälp av tillsatser och användas för tillverkning av halvledare strukturer med inkjet-skrivare, vilket är den mest lovande metoden för på en industriell produktions nivå beläggaden typen av material på substrat. Även om det finns välutvecklade metalliska och organiskabläck för tryckt elektronik, så finns det fortfarande ett behov av att förbättra eller utveckla nya bläck baserade på halvledarmaterial som t.ex. TMD, som är stabila, har goda bestryknings egenskaper och ger bra tryckkvalitet. Den inerta naturen tillsammans med de mekaniska egenskaperna som finns hosskiktade material, som t.ex. molybdendisulfid (MoS2), gör demlämpliga för flexibel elektronik och bearbetning i lösning. Dessutom gör den höga elektronmobiliteten i dessa 2D-halvledaredem till en stark kandidat som halvledarmaterial inom trycktelektronik. Det betyder att MoS2 är ett enkelt och robust material med goda halvledaregenskaper som är lämpligt för bestrykning från lösning och tryck, och är miljömässigt säker.Den metod som beskrivs här kan med fördel användas föratt exfoliera alla typer av 2D-material i lösning. Exfolieringensker i två steg; först mekanisk exfoliering av torr bulk med sandpapper, därefter används ultraljudsbehandling i lösning för att exfoliera nanosheets. De dispersioner som framställts i lösning med surfaktanter dekanterades och det övre skiktetanvändes i trycktester med en Dimatix inkjet-skrivare.Tryckprovet visar att det är möjligt att använda MoS2 -dispersion som ett inkjet-bläck och att optimering för särskildaskrivar- och substratkombinationer borde göras, såsom förbättringav bläcksammansättningen med avseende på droppbildning och break-off vid skrivarmunstycket, vilket i sin tur skulleförbättra tryckkvaliteten.
KM2
Paper Solar Cells
Kuba, Jakub. "Studium fotoluminiscence tenkých vrstev MoS2." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254284.
Повний текст джерелаGamage, Don Sampath. "Near-Field Nanoscale Spectroscopy and Imaging of Enveloped Virus Particles and Layered Materials." 2017. http://scholarworks.gsu.edu/phy_astr_diss/97.
Повний текст джерела"Surface Interactions of Layered Chalcogenides in Covalent Functionalization and Metal Adsorption." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.54971.
Повний текст джерелаDissertation/Thesis
Doctoral Dissertation Materials Science and Engineering 2019
Ullberg, Nathan. "Characterizing optical and electrical properties of monolayer MoS2 by backside absorbing layer microscopy." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-419630.
Повний текст джерелаZhang, Xian. "Experimenal and theoretical study of nano-materials (CNTs and TMDs)." Thesis, 2016. https://doi.org/10.7916/D8M045GG.
Повний текст джерела"Fundamental Toxicology Studies of 2D Transition Metal Dichalcogenides." Master's thesis, 2019. http://hdl.handle.net/2286/R.I.55629.
Повний текст джерелаDissertation/Thesis
Masters Thesis Materials Science and Engineering 2019
Hsu, Chin-Fu, and 許進富. "A study on the Design Guidelines of Multimedia Unit Instructional Materials: Taking the Outstanding Cases from TMRC as Examples." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/95059564837811835650.
Повний текст джерела臺北市立教育大學
數學資訊教育學系數學資訊教育教學碩士學位
97
This research tried to investigate the design guidelines of multimedia unit instructional materials. By way of context analysis and interviews, we explored some notes for the teaching implementation and material design of multimedia unit materials. Besides, we used tailored research tool to examine the outstanding cases of the group of elementary schools from Taipie Multimeida Resource Center. After analyzing the collected data, we obtained the following conclusions: 1. Among the 60 outstanging cases of the group of elementary schools from multimedia unit materials selection activities held by Taipei Multimedia Resource Center during the years from 2001 to 2008, there were 39 cases selected in the years 2002 and 2003. The distribution of these outstanding cases was: the first three learning areas were Science and Technology, Social Studies, and Arts and Humanities; the first three amounts were Life Education, Visual Arts, and Dialects. These outstanding cases were best suited for grade 5 and secondly for grade 6. 2. To design more applicable multimedia unit materials, eight aspects should be considered, namely, demands analysis, subjects analysis, instruction goals, curriculum content, media design, instructional design, instructional evaluation, and reveal of creativity. Material designers should use the guidelines for each aspects to inspect and modify the mutimedia unit material during the instructional planning, instructional design and instructional application stages. 3. After applying the 38 design guidelines to inspect the outstanding cases of the group of elementary schools from Taipei Multimedia Resource Center, we found that 24 design guidelines conformed to 90% above, accounts for 63.2%; 10 design guidelines conformed the range between 60% and 90%, accounts for 26.3%; 4 design guildlines did not tally with 90% above, accounts for 10.5%. According to the result of the study, we proposed some suggestions to the educational administrative organization, elementary schools, teachers, and for future research respectively.
Bhattacharyya, Swastibrata. "Tuning Electronic Properties of Low Dimensional Materials." Thesis, 2014. http://etd.iisc.ernet.in/handle/2005/2778.
Повний текст джерела(10723164), Suki N. Zhang. "Electronic Application of Two Dimensional Materials." Thesis, 2021.
Знайти повний текст джерела(11036556), Yen-yu Chen. "2D MATERIALS FOR GAS-SENSING APPLICATIONS." Thesis, 2021.
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Two-dimensional (2D) transition-metal dichalcogenides (TMDCs) and transition metal carbides/nitrides (MXenes), have been recently receiving attention for gas sensing applications due to their high specific area and rich surface functionalities. However, using pristine 2D materials for gas-sensing applications presents some drawbacks, including high operation temperatures, low gas response, and poor selectivity, limiting their practical sensing applications. Moreover, one of the long-standing challenges of MXenes is their poor stability against hydration and oxidation in a humid environment, which negatively influences their long- term storage and applications. Many studies have reported that the sensitivity and selectivity of 2D materials can be improved by surface functionalization and hybridization with other materials.
In this work, the effects of surface functionalization and/or hybridization of these two materials classes (TMDCs and MXenes) on their gas sensing performance have been investigated. In one of the lines of research, 2D MoS2 nanoflakes were functionalized with Au nanoparticles as a sensing material, providing a performance enhancement towards sensing of volatile organic compounds (VOCs) at room temperature. Next, a nanocomposite film composed of exfoliated MoS2, single-walled carbon nanotubes, and Cu(I)−tris(mercaptoimidazolyl)borate complexes was the sensing material used for the design of a chemiresistive sensor for the selective detection of ethylene (C2H4). Moreover, the hybridization of MXene (Ti3C2Tx) and TMDC (WSe2) as gas-sensing materials was also proposed. The Ti3C2Tx/WSe2 hybrid sensor reveals high sensitivity, good selectivity, low noise level, and ultrafast response/recovery times for the detection of various VOCs. Lastly, we demonstrated a surface functionalization strategy for Ti3C2Tx with fluoroalkylsilane (FOTS) molecules, providing a superhydrophobic surface, mechanical/environmental stability, and excellent sensing performance. The strategies presented here can be an effective solution for not only improving materials' stability, but also enhancing sensor performance, shedding light on the development of next-generation field-deployable sensors.
Smaili, Idris. "Applications of Magnetic Transition Metal Dichalcogenide Monolayers to the Field of Spin-orbitronics." Diss., 2021. http://hdl.handle.net/10754/670961.
Повний текст джерелаSigeda, Beata. "The effect of N on structure, mechanical properties and tribological behaviour of TMD coatings in contact with rubber." Master's thesis, 2016. http://hdl.handle.net/10316/36948.
Повний текст джерелаTransition metal dichalcogenides (TMD) coatings are solid low-friction self-lubricant materials enabling easy sliding by formation of a tribo lm at the interface in the contact region. W-S coating, which belongs to the TMDs family, was doped with N in order to combine low friction of the coating with good hardness due to addition of a third element. In this work, W-S and W-S-N coatings with di erent composition have been deposited by magnetron sputtering, characterised and evaluated with respect to the structure, mechanical properties and tribological performance. The composition was varied by changing the ow of N2 into the deposition chamber, leading to nitrogen contents ranging from 0 to 33 at.%. All coatings were deposited with Cr interlayer. Films W-S and W-S-N deposited with the lowest content of N had a crystalline structure, while coatings with the higher N content were amorphous. The coating were tribologically tested against nitrile-butadiene rubbe (NBR) balls at room temperature and 200 C using a pin-on-disc tribometer. Energy dispersive spectroscopy, optical microscopy observations and 2D pro lometry were performed after the tribological tests. The results showed that the coatings had better tribological performance at elevated temperature. The wear and friction behaviour of the coatings was interpreted as a function of several factors including: mechanical strength, structure and formation of the tribo lm. It was concluded that WS- N coatings supposedly could be material for applications requiring contact with rubber at temperatures greater than room temperature.
Os revestimentos de Dicalcogenetos de Metais de Transi c~ao (DMT) s~ao materiais s olidos, auto-lubri cantes com baixo-atrito que permitem um f acil deslizamento atrav es da forma c~ao de uma camada transfer^encia na interface da zona de contacto. Os revestimentos W-S, que pertencem a familia dos DMTs, foram dopados com N de forma a combinar o baixo atrito dos revestimentos com elevada dureza, atrav es da adi c~ao de um terceiro elemento. Neste trabalho, os revestimentos W-S e W-S-N com diferentes composi c~oes foram depositados, caraterizados e avaliados no que diz respeito o sua estrutura, propriedades mec^anicas e comportamento tribol ogico. A composi c~ao foi variada atrav es da mudan oa de uxo de N2 no interior c^amara de deposi c~ao, levando a uma varia c~ao at omica em azoto nos revestimentos de 0 a 33 %. Todos os revestimentos foram depositados com uma intercamada de Cr. Os lmes W-S-N depositados com o menor teor e sem N apresentam alguma cristalinidade, enquanto os revestimentos com maior percentagem de N s s~a amorfos. Os revestimentos foram tribologicamente testados por pino-disco com um contracorpo esf erico de borracha NBR o temperatura ambiente e a 200 C. Ap os os ensaios tribol ogicos, as amostras foram caracterizadas por EDS, microscopia otica e per lometria 2D. Os resultados demostraram que os revestimentos apresentam melhor performance a elevadas temperaturas. A taxa de desgaste e o coe ciente de atrito foram interpretados como fun c~ao de v arios fatores, incluindo: dureza, estrutura e forma c~ao da camada transfer^encia. Deste trabalho, podemos concluir que os revestimentos W-S-N podem ser usados em aplica c~oes que requeiram o contacto com borracha a temperaturas acima da temperatura ambiente havendo uma redu c~ao do atrito em rela c~ao ao deslizamento de metal borracha para as mesmas condi c~oes.
(7046639), Feng Zhang. "Transition Metal Dichalcogenide Based Memory Devices and Transistors." Thesis, 2019.
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