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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 61 for “"chalcogenides"”.
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Cyclopentadienyl ruthenium chalcogenides
The interaction of transition metal complexes with H$\sb2$S, SH$\sp{-}$ and S$\sbsp{2}{2-}$ ligands is of interest because of their chemical relevance to metal sulfide hydrodesulfurization (HDS) catalysts. Ruthenium sulfur complexes are of interest because of the favorable catalytic properties of …
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Exploring the Chemistry of Bis(azido)phosphine Chalcogenides and the Pursuit of Isolable Phosphinidene Chalcogenides
The study of low-coordinate species and the pursuit of interesting bonding motifs has revealed new reactivity modes for main-group compounds, akin to transition metals, in the past two decades. An underexplored class of two-coordinate phosphorus compound is a phosphinidene sulfide, which has yet to …
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Reversible electrical breakdown in amorphous chalcogenides
… of reversible electrical breakdown in amorphous chalcogenides with particular attention being paid to the on-state properties of Si12 Te48As30Ge10 glass threshold switches. Apparatus is described for the preparation of well-characterised materials and flash-evaporated thin-film switching devices. …
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Rapid materials discovery of ternary transition metal chalcogenides
… 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 spin, …
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STM Study of 2D Metal Chalcogenides and Heterostructures
… 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 monolayer …
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Exploring transition metal chalcogenides for bio sensing and environmental remediation
… electrocatalysts is evaluated. Transition metal chalcogenides are expected to have high catalytic performance owing to their facilitated electron cloud delocalization on the transition metal site as well as enhanced covalency in the lattice due to the low anion electronegativity. To examine this …
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Photoluminescence in rare earth activated oxides and II-VI chalcogenides
… are distinctly different from those of the IT-VI chalcogenides. Rare earth emissions consist of narrow emission bands which are predominantly due to transitions within the sheilded 4f orbital The visible emission spectra measurements of rare earth doped Y£J3, YV04' Gd202S and Y202S phosphors …
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Applications of fluorous chalcogenides and of radical cations in organic synthesis.
Applications of fluorous chalcogenides and of radical cations in organic synthesis.
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Interplay between chemical bonding, band structure and charge transport in thermoelectric chalcogenides
… to-date have been found in crystalline group IV chalcogenides, whose outstanding properties have been attributed to complex band structures and intrinsically low lattice thermal conductivities. The present dissertation aims at establishing a novel approach to identify chalcogenides suitable for …
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Nanofluids with optimised thermal properties based on metal chalcogenides with different morphology
… 1D and 2D nanostructures of transition metal dichalcogenides are colloidally stable over time and exhibit improved thermal properties compared to the typical thermal fluid used in solar power plants. The most promising nanofluids are those based on MoS 2 nanosheets and those based on WSe 2 …
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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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Design, synthesis, and characterization of complex chalcogenides for energy storage and energy conversion applications
<p>"Through this investigation, complex chalcogenides with the combination of main group metals, transition metals, and rare earth metals have been synthesized using the building block approach and their structure-property relationships are evaluated. The main emphasis of research is on rationally …
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A FACILE SYNTHESIS OF TRANSITION METAL OXIDE AND CHALCOGENIDES NANOCRYSTALS FOR ELECTROCATALYTIC APPLICA TIONS
Cobalt-manganese oxide spinel nanocrystal are well known for its excellent performance as supercapacitor electrode and electrocatalyst. The high surface to volume ratio of spinel nanoparticles enables high charge storage while the interactions between mixed valence transition metal elements in the …
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Ab initio Study of Atomic Dynamics and Thermal Properties of Inorganic Clathrates, Chalcogenides and Perovskite Oxides
… materials, namely inorganic clathrates, chalcogenides and perovskite oxides. Inorganic clathrates are promising candidates for thermoelectric applications due to their low thermal conductivity. In order to test approaches that improve the thermoelectric figure of merit of the inorganic …
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Computational modelling of the electronic and structural properties of chalcopyrite-type semiconductors and platinum group metal chalcogenides
An important aspect in the development of semiconducting devices for use in photovoltaic systems is the design of materials with appropriate band gaps. Electronic structure calculations based on Density Functional Theory (DFT) have been extensively used to study and to describe such properties of …
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Solution-Processed Thin Film Deposition and Characterization of Multinary Chalcogenides: Towards Highly Efficient Cu2BaSn(S,Se)4 Solar Devices
<p>Emerging multinary chalcogenide semiconductors have long been in the spotlight for addressing challenges related to the scarcity and toxicity of commercially available solar energy converting materials, CdTe and Cu(In,Ga)(S,Se)2. Kesterite-based Cu2ZnSn(S,Se)4 (CZTSSe) materials have emerged as …
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Exploring the Synthesis, Structure, and Reactivity of Phosphorus-Chalcogen Heterocycles
… Conversely, the area of phosphinidene chalcogenides, a low-coordinate phosphorus and chalcogen species, have yet to be thoroughly explored. In this context, this dissertation describes the synthesis of a number of phosphorus-chalcogen heterocycles that can be degraded to provide …
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ELECTROCATALYTIC PROCESSES FOR ENERGY STORAGE & CONVERSION
… 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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