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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Metal chalcogenides"”.
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Rapid materials discovery of ternary transition metal chalcogenides
… drawn tremendous attention is that of transition metal chalcogenides exhibiting strong d-electron correlations. These materials result in a plethora of exotic physical phenomena such as superconductivity, metamagnetic metallic behavior, and quantum phase transitions via a complex interplay of …
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STM Study of 2D Metal Chalcogenides and Heterostructures
… and spectroscopy (STM/S) investigation of 2D metal chalcogenides and heterostructures. The first part of the dissertation focuses on the continuous interface in WS2/MoS2 heterostructures grown by the chemical vapor deposition (CVD) method. We observed a closed interface between the MoS2 …
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Exploring transition metal chalcogenides for bio sensing and environmental remediation
… and biosensing. The state-of-the-art noble metal-based electrocatalysts have long been used in full water splitting, non-enzymatic glucose sensing, and supercapacitors. However, scarcity and high cost of noble metals restrict utilization of such electrocatalysts in large-scale …
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Nanofluids with optimised thermal properties based on metal chalcogenides with different morphology
… In this Doctoral Thesis, the use of transition metal dichalcogenide-based nanofluids as a heat transfer fluid in solar power plants has been investigated for the first time. Specifically, nanofluids based on one-dimensional, two-dimensional and three-dimensional MoS2 , WS2 and WSe2 …
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EARTH-ABUNDANT METAL CHALCOGENIDES: SYNTHESIS, INTERFACE MODIFICATION, AND APPLICATIONS IN ENERGY CONVERSION DEVICES
Metal chalcogenides (MCs) have attracted significant attention in a variety of energy devices for the wide range of properties that MCs can offer by combining different metal cations and chalcogen anions. However, the most common MCs used for photovoltaic and thermoelectric devices all consist rare …
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Computational modelling of the electronic and structural properties of chalcopyrite-type semiconductors and platinum group metal chalcogenides
… semiconductors which are transition-metal type and hence are strongly correlated materials. For our chosen systems we first used the Local Density Approximation (LDA) and Generalized Gradient Approximation (GGA) energy exchange correlation functionals within DFT as implemented in the …
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ELECTROCATALYTIC PROCESSES FOR ENERGY STORAGE & CONVERSION
… new devices. Over the last few years transition metal chalcogenides have emerged as highly efficient electrocatalysts for several electrochemical devices such as water splitting, carbon dioxide electroreduction and, solar energy converters. These transition metal chalcogenides exhibit high …
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Controlled Synthesis and Characterization of Magnetic Chalcospinels Nanocrystals
Binary and ternary metal chalcogenides have become well-known materials among chemists, physicists, material scientists, and other researchers of the field, and they have attracted significant attention because of their novel chemical, magnetic, electronic, mechanical and optical properties. Among …
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Metal oxide electrocatalysts for alternative energy technologies
This dissertation focuses on the development of metal oxide electrocatalysts with varying applications for alternative energy technologies. Interest in utilizing clean, renewable and sustainable sources of energy for powering the planet in the future has received much attention. This will address …
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Designing interfacial structures for selective electrocatalysis
… and anode catalysts. For the cathode, transition metal chalcogenides are selective catalysts for the oxygen reduction reaction. We investigate the structure, activity, surface dynamics, and mechanism of a nickel sulfide catalyst during the oxygen reduction catalysis. By employing the selective …
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Designing high performance overall water splitting electrocatalysts from non-precious metal selenides
… for the OER. Lately first row transition metal chalcogenides have experienced an improving attention for hydrogen evolution reaction (HER). Over the course of the past two and half years, we have designed, synthesized and evaluated a series of heterogeneous water splitting catalysts based …
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Electronic excitation and atomic forces in optically excited group V semimetals
… Recent experimental work in the group V semimetals have shown that the symmetry-breaking $E_g$ mode is driven by a force which decays in $\sim 10$ fs, a timescale much shorter than the period of the mode, explaining its small amplitude. However, the exact mechanism for this decay has remained …
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New materials with potential for optical device applications: The synthesis and characterization of new mixed-metal quaternary sulfides and selenides
… the exploratory synthesis of new mixed-metal chalcogenides, particularly sulfide and selenide compounds, that might display potential for such applications. Our strategy in designing new compounds was to incorporate heavy metals, which display low or intermediate cation coordination, …
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Scanning tunneling microscopy and spectroscopy study of layered transition metal chalcogenide thin films tuned by thickness, structural phase, and heterostructure
Layered transition metal chalcogenides (TMCs) have a long and fruitful history, exhibiting diverse properties and interesting quantum phenomena, such as superconductivity, charge density wave (CDW), and non-trivial topological states. Since the discovery that layered materials can be exfoliated to …
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Deposition of CoxSy, NixSy MnS and CdS thin films from their alkylthiourea precursors using the Aerosol Assisted Chemical Vapour Desposition (AACVD) technique
… synthesized, using the 1:2 mole ratio metal salts of (NiCl^ C0CI2, MnCfe and CdCh) with their respective ligands. These complexes were characterized using melting points and elemental analysis to distinguish their monomelic character and confirm the purity of the complexes. Single X-ray …
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Surface instabilities and interfacial phenomena for nanomanufacturing at the atomically-thin limit
… analogs such as semiconducting transition metal chalcogenides, thus creating highly uniform and periodic lateral superlattice configurations. In addition, the generality of this self-patterning scheme allows for facile and scalable definition of nanoscale architectures for template guided …
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The use of metal complexes to deposit metal chalcogenide thin films and nanoparticles
… The second chapter focuses on the deposition of metal chalcogenides thin films from single molecular precursors of the type [M {N(EPR2)2}2], were M = Pt, Pd, Ni; E = S or Se and R = fPr or Ph. Ligands of the type R2P(E)NP(E)R2, where R = *Pr or Ph were prepared to synthesize these precursors. …
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Cs-Pb-Br Core-shell Perovskite Microcrystals for Stability Improvement
… and inorganic materials (such as NaBr, TiO2, and metal chalcogenides, as well as perovskites, e.g., Cs4PbBr6, CsPb2Br5, and Rb4PbBr6) used for covering a perovskite core. In this paper, the most promising approach involves coating perovskite NCs (PeNCs) with a crystalline perovskite shell by in …
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