Global ETD Search
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 17 of 17 for “"Layered material"”.
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Magnetoresistance and Thermoelectricity in Quasi-Low Dimensional Semimetals
… bands and transport properties of the quasi-1D layered material ZrTe₅. For vacancy doped crystals, we report a transport, thermodynamic, and spectroscopic study with a focus on elucidating the connections between its band structure and unusual thermoelectric properties. For crystals in the …
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A layered sodium titanate as promising anode material for sodium ion batteries
… low cost of sodium source. Although some cathode materials with desirable electrochemical properties have been proposed, it's quite challenging to develop suitable anode materials with high energy density and good cyclability for sodium ion batteries. Herein, we report a layered material, …
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Synthesis and photo-response study on GaSe and InSe atomic layers
The two dimensional atomically layered materials are drawing intense attention in recent years, because of their special physical properties. Graphene, as a layered material with large charge carrier mobility, has been studied for years. Besides, graphene, large amounts of materials exhibit unique …
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Hall effect in untwinned single-crystal superconducting YBa2Cu307-y
… an isotropic superconductor and YBa2Cu3o7_Y is a layered material, we compared our data to an extended version. We calculated terms that were lacking and corrected mistakes in the literature to arrive at a complete and consistent theory for the effect of fluctuations on the Hall effect in a …
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Effect of a Graded Layer on the Plastic Dissipation During Mixed-Mode Fatigue Crack Growth on Ductile Bimaterial Interfaces
… Since then, this theory has been extended to layered material systems that typically include mixed-mode loading and elastic/plastic mismatch. Previous research by the author first extended this theory to include a graded layer (i.e., no step change in material properties across the crack …
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A Comprehensive Study Of Nonlinear Effects Of Coupling Materials In Ultrasound Infrared Imaging
… for the quantitative characterization of materials, components and structures. It is a key process used in product evaluation, troubleshooting for the quality assurance in industry. Sonic Infrared (IR) Imaging technology is a hybrid sensing and imaging technique, in which cracks in an …
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Photodetectors for graphene-based integrated photonics
… Then, I demonstrate PTE-GPDs—fabricated from layered material heterostructures—on a silicon-on-insulator microring resonator. Both detectors operate at Telecom wavelengths (λ = 1.55 μm), are compatible with high-speed (> 10 GHz) operations, and hold the current records in voltage …
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Transient Photophysics of Bismuth Halide Semiconductors for Optoelectronic Applications
… their fundamental photophysical properties. The materials investigated — the double perovskite Cs2AgBiBr6, bismuth iodide, and bismuth oxyiodide — have all been demonstrated in thin film photovoltaic devices fabricated at low temperatures. Propelled by the success of lead halide perovskites, this …
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Controlled Attachment of Nanoparticles to Layered Oxides
<p>A series of oxide materials were modified with different nanoparticles (NPs). Novel cobalt@H<sub>4</sub>Nb<sub>6</sub>O<sub>17</sub> nanopeapod structures were fabricated and magnetic NPs modified oxide nanosheets and nanoscrolls were prepared. Both aqueous method and two-phase method were …
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Excitons in Two-Dimensional Materials: from Many-Body Physics to Quantum Technologies
… in the order of meVs due to the 2d nature of the material. In this Thesis I fi rst explore complex exciton species within a particular TMD, WSe₂, that arise due to charge-mediated interactions. In particular, biexcitons are bound exciton pairs that hold great interest from a fundamental standpoint …
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STUDIES OF 2D LAYERED MnO2 AND MoS2 FOR ANTIBACTERIAL AND ELECTROCHEMICAL APPLICATIONS
… parameters to tune the properties of two layered materials, MoS2 and MnO2 for applications such as antibacterial, energy storage and water remediation. Two aspects of the materials were investigated. Firstly, the synthetic parameters were tuned to prepare material with different …
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Nano-engineering of Atomically Thin Novel 2D Materials and Their Heterostructures
Two dimensional layered material has attracted profound interest from material science and nanotechnology community, due to its marvelous optical, electrical and magnetic properties. In addition to Transition metal dichalcogenides (TMDs), several new ferroelectric, ferromagnetic (FM), …
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Nano-engineering of Atomically Thin Novel 2D Materials and Their Heterostructures
Two dimensional layered material has attracted profound interest from material science and nanotechnology community, due to its marvelous optical, electrical and magnetic properties. In addition to Transition metal dichalcogenides (TMDs), several new ferroelectric, ferromagnetic (FM), …
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High Yield Fabrication of Monolayer WSe₂ Mechanical Resonators and a Study of Their Loss Mechanisms
… bending losses dominate mechanical losses in layered material (LM) resonators at room temperature, and that dissipation dilution will work as a method of improving quality factors. Finally I describe my investigation into mechanical loss mechanisms at cryogenic temperatures through the use of …
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Optimisation, Stabilisation, and Localisation of Quantum Emitters in Layer-Engineered Hexagonal Boron Nitride
… (hBN) has been considered the silent sister material of graphene, but recently an appreciation for it is starting to grow within the scientific community for the properties it possesses and not just its functionality as graphene’s supporting partner. The discovery of its ability to host …
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Functional materials for thermal regulation
Developing thermal management materials with greater functionality for the control of heat dissipation and regulation is a fundamental step to improve the performance in many engineering systems. This dissertation presents experimental studies of heat conduction in distinctive thermal functional …
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Quantum Transport and Electric-Field Effects in Layered Topological Semimetals and Magnetic Materials
… transport experiments on quantum devices in layered Dirac nodal line topological semimetals and antiferromagnetic materials down to a few layers. We used gate-induced effects to alter the transport properties of these materials. </p> <p>First, we introduced current annealing in topological …