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Dissertations / Theses on the topic 'TMC (transition metal chalcogenides)'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Lima, Bruno Sanches de. "Crescimento de monocristais e investigação experimental de propriedades físicas de calcogenetos de nióbio." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/97/97135/tde-03122018-164756/.

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Recentemente foi descoberto que diversos calcogenetos de metais de transição podem ter o estado charge density waves (CDW) suprimido a partir de pressão hidrostática e dopagens, e, por conseguinte, o estado supercondutor emerge. Nesse contexto, este trabalho apresenta um estudo sistemático de propriedades físicas de amostras poli e monocristalinas de dois compostos do sistema Nb-Te, NbTe2 e NbTe4. Com relação ao composto NbTe2, os resultados aqui apresentados demonstram que esse composto é mais um exemplo de material que exibe ambos os estados a pressão atmosférica e sem dopagens. No que tange

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2

Shaw, Graham Andrew. "Solvent mediated synthesis of metal chalcogenides." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326065.

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3

Nahai-Williamson, Paul. "Tuning ordered states in transition metal chalcogenide systems." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609901.

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4

Pickup, David M. "The structure and characterisation of amorphous transition-metal chalcogenides." Thesis, University of Reading, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308039.

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5

Nakanishi, Makoto. "Study of magnetic ordering of vanadium in layered transition metal chalcogenides." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/136959.

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6

Zhu, Bairen, and 朱柏仁. "Optical study on two dimensional transition metal dichalcogenides." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208045.

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Atomically thin group-VI transition metal dichalcogenides (TMDC) has been emerging as a family of intrinsic 2-dimensional (2D) crystals with a sizeable bandgap in the visible and near infrared range, satisfying numerous requirements for ultimate electronics and optoelectronics. This intrinsic 2D crystal also provides a perfect platform for physics study in 2D semiconductors. The characteristic inversion symmetry breaking presented in monolayer TMDCs leads to non-zero but contrasting Berry curvatures and orbital magnetic moments at K/K’ valleys located at the corners of the first Brillouin zone

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7

Tsang, Ka-yi, and 曾家懿. "Two dimensional transition metal dichalcogenides grown by chemical vapor deposition." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/212604.

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An atomically thin film of semiconducting transition metal dichalcogenides (TMDCs) is emerging as a class of key materials in chemistry and physics due to their remarkable chemical and electronic properties. The TMDCs are layered materials with weak out-of-plane van der Waals (vdW) interaction and strong in-plane covalent bonding enabling scalable exfoliation into two-dimensional (2D) layers of atomic thickness. The growth techniques to prepare these 2D TMDC materials in high yield and large scale with high crystallinity have attracted intensive attention recently because of the new properties

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8

Walton, Richard I. "The characterisation and structure of amorphous and poorly crystalline transition-metal chalcogenides." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388467.

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9

Eaglesham, D. J. "Charge density waves and their phase transitions in the transition metal chalcogenides." Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375017.

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10

Li, Tianyang. "Synthesis and Characterization of Atomic Scale Derivatives and Clusters of Transition Metal Chalcogenides." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460839448.

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11

Jürgensen, Lasse [Verfasser]. "Thin Films of Transition Metal Chalcogenides: Novel Molecular Pathways and Catalytic Applications / Lasse Jürgensen." München : Verlag Dr. Hut, 2021. http://d-nb.info/1232846740/34.

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12

Lo, Wing-yin, and 盧詠妍. "Syntheses, characterization and emission studies of luminescent homo-and heterometallic clusters based on coinage metal alkynyl andchalcogenide core." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B31245791.

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13

Guo, G. Y. "Study of the electronic structures of layer-structure transition metal chalcogenides and their intercalation complexes." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233953.

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In this thesis, we present results of studies of the electronic band structures and related electronic properties of some layered transition metal chalcogenides and their intercalation complexes. The materials investigated include group VIIc transition metal dichalcogenides, and 2H-TaS<SUB>2</SUB> and its lithium-, lead-, and tin-intercalated complexes, as well as dihafnium sulphide and selenide. Both experimental measurements and theoretical elect'onic band structure calculations have been carried out. The types of measurements conducted consist of reflectivity measurements in the energy rang

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14

Gatuna, Ngigi wa. "Intrinsic vacancy chalcogenides as dilute magnetic semiconductors : theoretical investigation of transition-metal doped gallium selenide /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/10595.

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15

Koeckerling, Martin Dr rer nat. "Über metallreiche Halogenide und Chalkogenide früher Übergangsmetalle - Metal-rich halides and chalcogenides of early transition elements." Gerhard-Mercator-Universitaet Duisburg, 2001. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-09112001-094019/.

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This habilitation thesis describes the syntheses and characterizations of mostly new metal-rich cluster compounds of early transition elements. It is devided into 4 parts. The first part describes the syntheses and solid-state X-ray structures of a total of 14 mixed-halide (iodide-chloride) zirconium cluster phases, which crystallize in 9 different (some novel) structure types. All these cluster phases contain octahedral Zr6Z-units that are centered by an interstitial atom Z. Phase widths and relations between the differend structure types are discussed. The second part deals with molecular (s

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16

Stahl, Juliane [Verfasser], and Dirk [Akademischer Betreuer] Johrendt. "Low-dimensional transition metal chalcogenides : Synthesis and characterization of beta-FeSe- and Fe3GeTe2-related structures / Juliane Stahl ; Betreuer: Dirk Johrendt." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1204005559/34.

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17

Belke, Christopher [Verfasser]. "Untersuchung von Dünnschicht-Übergangsmetall-Chalkogeniden hinsichtlich ihrer elektrischen Eigenschaften : Investigation of thin film transition metal chalcogenides regarding their electrical properties / Christopher Belke." Hannover : Gottfried Wilhelm Leibniz Universität, 2021. http://d-nb.info/1230550666/34.

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18

Ghorbani-Asl, Mahdi [Verfasser], Thomas [Akademischer Betreuer] Heine, Ulrich [Akademischer Betreuer] Kleinekathöfer, Thomas [Akademischer Betreuer] Frauenheim, and Agnieszka [Akademischer Betreuer] Kuc. "Electronic transport through two-dimensional transition-metal chalcogenides / Mahdi Ghorbani-Asl. Betreuer: Thomas Heine. Gutachter: Thomas Heine ; Ulrich Kleinekathöfer ; Thomas Frauenheim ; Agnieszka Kuc." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2014. http://d-nb.info/1087315506/34.

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19

Prasai, Kiran. "Gap Engineering and Simulation of Advanced Materials." Ohio University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1503393620371266.

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20

MONDOLONI, CHRISTIAN. "Contribution a l'etude de la valence anormale de l'ytterbium et du thulium dans yb : :(1-x)tm::(x)se et yb::(1-y)tm::(y)s." Paris 7, 1988. http://www.theses.fr/1988PA077122.

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Etude experimentale de l'instabilite de la valence des atomes de tm en fonction de la concentration dans les composes du titre. On mesure la valence des atomes de tm par susceptibilite magnetique et absorption rx, et on met en evidence une divergence de resultats par ces deux methodes. On met en evidence une transition metal-semiconducteur pour x=0,84, un ordre antiferromagnetique a 1,5 k, une magnetoresistivite negative. L'etude des sulfures amene a interpreter les proprietes de transport dans le domaine y >ou= 0,08 pour t>15 k par l'effet kondo

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21

Berretil, Slimane. "Proprietes electroniques des semi-conducteurs magnetiques gamo : :(4)s::(8), gamo::(4)se::(8), gamo::(4)se::(4)te::(4) et ganb::(4)s::(8)." Paris 6, 1987. http://www.theses.fr/1987PA066262.

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Etudes effectuees en vue de preciser la nature des electrons qui participent ala conduction et au magnetisme de ces composes. Les composes, caracterises par la presence d'amas tetraedriques des ions metalliques mo et nb dans les bas etats d'oxydation, revelent des proprietes de magnetisme itinerant repondant au modele de stoner-wohlfarth avec les densites d'etats les plus elevees observees dans des composes intermetalliques 3d ou 4d. La rpe a confirme que les raies observees correspondant aux ions metalliques dans un etat s = 3/2 (ions mo**(3+) et nb**(3+)); leur elargissement est d'origine di

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22

Mukherjee, Debdyuti. "Electrocatalytic Studies Using Layered Transition Metal Thiphosphates, Metal Chalcogenides and Polymers." Thesis, 2017. http://etd.iisc.ernet.in/2005/3569.

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The ever increasing demand for energy due to over consumption of non-renewable fossil fuels has emphasized the need for alternate, sustainable and efficient energy conversion and storage systems. In this direction, electrochemical energy conversion and storage systems involving various fundamental electrochemical redox processes such as hydrogen evolution (HER), oxygen reduction (ORR), oxygen evolution (OER), hydrogen oxidation (HOR) reactions and others become highly important. Electrocatalysts are often used to accelerate the kinetics of these reactions. Platinum (Pt), ruthenium oxide and ir

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23

Abdulsalam, Mahmud. "A theoretical investigation of the structural, electronic and optical properties of transition metal chalcogenides." Thesis, 2015. http://hdl.handle.net/10539/19291.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for the degree of Doctor of Philosophy. Johannesburg, October, 2015.<br>Harvesting renewable energy and the miniaturisation of electronic components are among the major challenges of the 21st century. Transition metal chalcogenides (TMC) have interesting properties that are promising in meeting these challenges. It is therefore important to conduct a systematic theoretical study of the structural, electronic and optical properties of the transition metal chalcogenid

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24

Jianxiao, Xu. "Thermoelectric properties of transition metal oxides and thallium main group chalcogenides." Thesis, 2008. http://hdl.handle.net/10012/3848.

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Thermoelectric energy (TE) conversion can be used to create electricity from temperature gradients. Hence power can be generated from waste heat using TE materials, e.g. from the exhaust in automotives. This power in turn may lead to a reduction of gas consumption by reducing the alternator load on the engine. Because of the increasing demand and limited availability of energy sources, there is strong and renewed interest in advancing thermoelectric materials. Past research shows that the best TE materials are narrow band gap semiconductors composed of heavy elements, exhibiting a large Seebec

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25

Rugut, Elkana Kipkogei. "Numerical simulation of structural, electronic and optical properties of transition metal chalcogenides." Thesis, 2017. http://hdl.handle.net/10539/23602.

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A dissertation submitted to the Faculty of Science University of the Witwatersrand, in partial fulfilment of the requirements for the degree of master of science (MSc) School of physics, University of Witwatersrand, 2017.<br>Intensive study on structural, electronic and optical properties of bulk transition metal dichalcogenides and dipnictogenides (MX2; where M = V, Nb and X = S, Se, Te, P) was undertaken. A relative stability test was done to determine the most stable ground state conﬁguration via calculation of total ground state energy and volume which was ﬁtted to the third order Birch-Mu

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26

I-ChuLiang and 梁逸筑. "Sytheses and Characterization of Metal Chalcogenides Base on Mixed Rear-Earth and Transition Metals." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/30878555846446225807.

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27

(10716999), Sayan Roy. "Modeling Ultrathin 2D Transition Metal Di-Chalcogenides (TMDCs) Based on Tungsten for Photovoltaic Applications." Thesis, 2021.

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Atomically thin 2D layered semiconductor materials such as Transition Metal Di-Chalcogenides (TMDCs) have great potential for use as flexible, ultra-thin photovoltaic materials in solar cells due to their favorable photon absorption and electronic transport properties. In this dissertation, the electronic properties, such as band structure and bandgap, and optical absorption properties of a TMDC known as Tungsten Disulfide (WS2) were obtained from Density Functional Theory (DFT) calculations to design conventional and unconventional solar cells. Using these properties, a 1 μm thick heterojunct

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28

Altschul, Emmeline Beth. "Transition metal solar absorbers." Thesis, 2012. http://hdl.handle.net/1957/33382.

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A new approach to the discovery of high absorbing semiconductors for solar cells was taken by working under a set of design principles and taking a systemic methodology. Three transition metal chalcogenides at varying states of development were evaluated within this framework. Iron pyrite (FeS��) is well known to demonstrate excellent absorption, but the coexistence with metallic iron sulfides was found to disrupt its semiconducting properties. Manganese diselenide (MnSe��), a material heavily researched for its magnetic properties, is proposed as a high absorbing alternative to iron pyri

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29

Venkatakrishnan, T. S. "Ruthenium Complexes Of Chiral And Achiral Phosphorus Ligands Based On The P-N-P Motif." Thesis, 2004. http://hdl.handle.net/2005/300.

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In recent years there is an increasing awareness of the importance of chiral phosphorus ligands in transition metal organometallic chemistry because of the utility of such complexes in homogeneous catalytic reactions. This thesis deals with synthetic, spectroscopic and X-ray crystallographic studies on ruthenium complexes of chiral and achiral P-N-P type ligands, known as "diphosphazanes", with emphasis on ruthenium carbonyl clusters. Several ruthenium carbonyl clusters have been synthesized and characterized by elemental analyses, ER and NMR (lH, nC and 3lP) spectroscopic data. In several ins

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30

Kiran, Vankayala. "Physicochemical, Electrical and Electrochemical Studies on Titanium Carbide-Based Nanostructures." Thesis, 2013. http://etd.iisc.ernet.in/2005/3325.

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Materials for studies related to nanoscience and nanotechnology have gained tremendous attention owing to their unique physical, chemical and electronic properties. Among various anisotropic nanostructures, one dimensional (1D) materials have received immense interest in numerous fields ranging from catalysis to electronics. Imparting multi-functionality to nanostructures is one of the major areas of research in materials science. In this direction, use of nanosized materials in energy systems such as fuel cells has been the subject of focus to achieve improved performance. Tuning the morpholo

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