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.
Results
Showing 1 to 20 of 213 for “"atomic scale"”.
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Atomic-Scale Characterization of Nanometer-Sized Graphene
We have developed a method for depositing atomically clean, nanometer-sized graphene monolayers with 2-30 nm lateral dimensions and we probe the local electronic properties of the graphene using the ultrahigh-vacuum scanning tunneling microscope (UHV-STM). By using tunneling spectroscopy, we …
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Atomic -Scale Statistical Models of Semiconductor Device *Reliability
We have developed a detailed model for hot-carrier induced interface state generation in silicon metal-oxide semiconductor field-effect transistors (MOSFETs). In the process, we discuss a different interpretation of the isotope effect of silicon-hydrogen (deuterium) bond dissociation by electronic …
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Atomic Scale Statistical Models of Semiconductor Device Degradation
We have developed a detailed model for hot-carrier induced interface state generation in silicon metal-oxide semiconductor field-effect transistors (MOSFETs). In the process, we discuss a different interpretation of the isotope effect of silicon-hydrogen(deuterium) bond dissociation by electronic …
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Atomic scale diffusion in complex systems from first principles
… Therefore, a quantitative prediction of atomic scale transport is crucial to development of new alloys. First principles calculations coupled with advanced diffusion models can accurately predict atomic scale transport mechanisms of point defects in solids. In this work, we examine …
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Controlling and Understanding Atomic-Scale Dynamics within Plasmonic Nanogaps
… structure, are able to confine light to nanoscale volumes and enhance optical fields by orders of magnitude. This enhancement allows a few hundred molecules placed in this gap, such as biphenyl-4-thiol, to be probed by techniques like surface-enhanced Raman spectroscopy (SERS). In addition, …
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Interplay between Mechanics, Electronics, and Energetics in Atomic-Scale Junctions
The physical properties of materials at the nanoscale are controlled to a large extent by their interfaces. While much knowledge has been acquired about the properties of material in the bulk, there are many new and interesting phenomena at the interfaces that remain to be better understood. This …
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Modeling and Simulating Biomolecular Machineries at Atomic Scale and Beyond
… mainly by modeling the molecular systems at the atomic scale and simulating them using molecular dynamics (MD) techniques. Since physiological functions of those systems usually involve time scales much longer that can currently achieve through atomic-scale MD simulations, other computational …
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Microscopic characterization of beta-barrel proteins using atomic scale simulations
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-04-06 without embargo terms
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Internal atomic-scale structure and photothermal dynamics of heterostructured nanomaterials
… While our XAS data were obtained at a large-scale synchrotron X-ray facility with specialized infrastructure and limited access, the advent of tunable high-brightness table-top X-ray sources will enable characterization studies on heterostructured photovoltaic and photocatalytic nanomaterials …
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Atomic-scale and three-dimensional transmission electron microscopy of nanoparticle morphology
… motivates comprehensive elucidation of nanoscale materials. This thesis addresses transmission electron microscope characterisation of nanoparticle morphology, concerning specifically the crystal- lographic status of novel intermetallic GaPd2 nanocatalysts and advancement of electron …
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Understanding and designing carbon-based thermoelectric materials with atomic-scale simulations
… investigated thermal transport in graphene with atomic-scale classical simulations, which has been shown that the use of two-dimensional (2D) periodic patterns on graphene substantially reduces the room-temperature thermal conductivity compared to that of the pristine monolayer. This reduction is …
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Atomic-Scale Design at the 2D/3D Interface using Electron Microscopy
… metals or semiconductors. At relevant length scales the nanomaterial properties can be altered by the placement of even a single atom or defect in the periodic arrangement of atoms, necessitating the development of new techniques for creating and understanding atomically-precise interfaces. We …
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Minimal stochastic models for non-equilibrium effects and atomic-scale friction phenomena
Diese Dissertation behandelt minimale stochastische Modelle im Überlappungsbereich von atomarer Reibung und Nichtgleichgewichts-Phänomenen der Brown'schen Molekularbewegung. Der thematische Schwerpunkt liegt dabei auf der Untersuchung von dynamischen Effekten in Zwei- und Mehrteilchen-Systemen, in …
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Visualizing Cooper Pair Formation on the Atomic Scale in High Temperature Superconductors
… the process of the pair formation on the atomic scale. The magnitude of the low-temperature superconducting gap measured in Bi2Sr2CaCu 2O8+delta shows a large nanoscale spatial variation. These superconducting gaps evolve smoothly with temperature and close locally over a range of …
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Electron-beam lithography towards the atomic scale and applications to nano-optics
… important to push nanotechnology toward the atomic scale. In this thesis we show a comprehensive study of the resolution limiting factors of EBL. We demonstrated that low-energy (sub-5 keV) EBL is able to achieve sub-10 nm half-pitch structures. We investigated the resolution of EBL using an …
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Single molecule conductance spectroscopy: probing the gold-bio interface at the atomic scale
… biologically relevant molecules with gold at the atomic level. Firstly, we identify imidazole as a pH-activated linker for forming stable single gold molecule junctions, which present several distinct configurations and reproducible electrical characteristics. We then examine the resulting …
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Atomic-scale assessment of graphene-substrate interactions, grain boundaries, and materials for heterostructures
… devices, primarily defects from wafer-scale graphene synthesis, graphene-substrate interactions, and growth of graphene’s insulating analog, hexagonal boron nitride (h-BN). These experimental studies are fundamental in nature, but they highlight parameters relevant to applications. …
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Atomic-scale studies of bending in two-dimensional materials using transmission electron microscopy
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Atomic Scale Characterisation of Pt-Re/CeO2 for the Water Gas Shift Reaction
… For this to happen, economically feasible, large scale production of hydrogen gas is required. Currently, electrolysis is unable to meet this demand economically, so steam reforming of hydrocarbons (e.g. methane) is required to produce large volumes of hydrogen. To be used for mobile applications, …
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