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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 29 for “"Chalcogen"”.
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Ligand reactivities in platinum and palladium chalcogen complexes
In this thesis we shall report on two metalloligands, [Pt2(B5-X)2(dppy)4] and [PtX4(P-P)] (X = S or Se; P-P = 2PPh3 or dppe) and their heterometallic aggregates. The high reactivity of d10 metal-metal bonded complexes towards {PtX4} and {Pt2(B5-S)2} core have been demonstrated through the …
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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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Fundamental computational investigations of halogen and chalcogen bonding : electronic structure and reactivity.
… but not limited to, hydrogen, halogen, and chalcogen bonding. These σ-holes are formed by a redistribution of electron density on an atom toward a bonded atom and form a noncovalent bond with a nucleophilic Lewis base. Despite how long σ-hole interactions have been known, their fundamental …
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Optical and transport studies of atomic hydrogen and chalcogen impurities in alkali metals
Atomic hydrogen and chalcogen (0 and Te) impurities in alkali metal thin films have been studied. Their optical properties were determined by transmission measurements in the vacuum ultraviolet and transport properties were probed by means of electrical resistance. The observed optical absorption …
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The Effects of Main Group Elements on Transition Metal Carbonyl Clusters (Tellurium, Assembly, Chalcogen, Sulfur, Ditelluride)
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1986.
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An investigation into the use of group VI elements as dopants in III-V materials prepared by molecular beam epitaxy
… (MBE). This source produces a pure oeam ot chalcogen dimers at low temperature (200-300°C) and is simply programmed by an applied emf. The response time of the cell is of the order of one second enabling complicated doping profiles to be achieved.
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Photoluminescence from Defects in Two-Dimensional Transition Metal Dichalcogenides
Atomic defects in monolayer transition metal dichalcogenides (TMDs) such as chalcogen vacancies significantly affect their properties. In this thesis, I provide a reproducible and facile strategy to rationally induce chalcogen vacancies in monolayer MoS<sub>2</sub> by annealing at 600 °C in an …
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An Experimental Study Of Atomic Scale Friction And Adhesion For 2d And Layered Materials: The Effects Of Interfacial Contact, Compliance, And Commensurability
… Fourthly, the friction force decreases as chalcogen size increases in MoX2 (X=S, Se, Te) such that the friction force follows MoS2>MoSe2>MoTe2. An increase in chalcogen size increases the lattice spacing, creating a wider pathway that allows the tip to detour around high energy sites and …
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Structural and Elastic Properties of Degenerate SnO Monolayers at Finite Temperature
<p>Chalcogen-based layered superconductors with a litharge structure such as FeS and FeSe mono-layers undergo structural and superconducting phase transitions that are tunable by doping. Representing another material platform with a litharge structure but without valence d-electrons, SnO monolayers …
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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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Coinage Metal Chalcogenide Clusters with N-Heterocyclic Carbene Ancillary Ligands
… prepared from reactive group 11 trimethylsilylchalcogenolate reagents (NHC-M-ESiMe3; M = Cu, Au; E = S, Se, Te) by silane deprotection reactions with phosphine- or phosphite-solubilized group 11 acetates (R3P-M-OAc; M = Cu, Ag, Au). Clusters were characterized by combustion analysis and …
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Accelerating the Discovery of Novel Metal Organic Chalcogenolates: A Computational and Machine Learning-Driven Approach
Metal Organic Chalcogenolates (MOChas) are a class of robust, self-assembling, and hybrid materials featuring inorganic metalo-chalcogen frameworks that are scaffolded by organic ligands. These low-dimensional structures exhibit tunable optoelectronic properties, making them promising candidates …
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The Synthesis, Reactivity and Electrochemical Study of Metallocene Substituted α-Diimine Ligands
… diiminopyridine and its low-valent chalcogen (S2+, Se2+, Te2+) and pnictogen (P+) complexes are discussed. These complexes represent the first such examples of utilizing low-valent main group systems containing redox-active ligands with pendant ferrocenyl substituents. Other work …
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Thermoelectric and Charge Transport in Doped Semi-Crystalline Polymers
… data. Moreover, side-chain modification and chalcogen substitution have been established to affect the properties of semiconducting organic materials. In this thesis, we also investigate their effects on doping as well as electrical and thermoelectric properties. The adopted polar side chain …
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Charge Transport in Field-Effect and Ion-Gel Gated Conjugated Polymers
… organic materials can be altered by chalcogen substitution. In this thesis, we not only explore the effects of chalcogens on the field-effect charge transport properties of such materials but also examine the effect of chalcogens upon doping. It is considered that interchain …
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Towards the development of calcium ion batteries
… couple. Several transition metal oxide and other chalcogen-based structures were explored as calcium cathode materials. Vanadium oxide (V2O5), iron sulfide (FeS2) and molybdenum selendide (Mo3Se4) could be reversibly cycled. The behavior of Mo3Se4 was studied in greater detail, and its …
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Cross-sectional transmission electron microscopy study of femtosecond laser-irradiated selenium-doped 'black' silicon
… process to incorporate large amounts of chalcogen dopants. The material has been found to have greatly increased absorbance of visible and infared wavelength light in comparison to undoped crystalline silicon. Selenium-doped black silicon that had been annealed at different temperatures …
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Phase-Engineered Field-Effect Transistors Based on Two-Dimensional Transition Metal Dichalcogenides
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) are layered materials in which each unit consists of a transition metal (Mo, and W) layer sandwiched between two chalcogen (S, Se, and Te) atomic layers. They can exist in either a semiconducting or metallic phase. Semiconducting TMDC …
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Luminescent Harnessing of 2D Transition Metal Dichalcogenide Excitons
… (2D) semiconducting transition metal dichalcogenides (TMDs) are regarded as viable candidates for future high-performance optoelectronic and electronic devices due to their chemical stability, low dimensionality, direct bandgap and favourable electronic mobilities. Their direct bandgap …
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Chalcogenide glass materials for integrated infrared photonics
Chalcogenide glasses (ChGs) are amorphous compounds containing the chalcogen elements (S, Se, Te) and exhibit wide infrared transparency windows. They are easy to synthesize in bulk and thin film forms and their compositional flexibility allows tuning of optical properties such as refractive index …
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