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 15 of 15 for “"high resolution electron microscopy"”.
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Quantitative Automated Object Wave Restoration in High-Resolution Electron Microscopy
… is the accurate and automated determination of electron microscope imaging conditions. This enables the restoration of the object wave, which confers direct structural information about the specimen, from sets of differently aberrated images. An important member in the imaging chain is the image …
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Lattice Strain Measurements of Deuteride Phase Formation in Epitaxial Niobium on Sapphire
… dislocation formation has been confirmed with high-resolution electron microscopy (HREM) for the 1200A Nb film. The HREM images were used to estimate a dislocation density of 1012 cm-2 after repeated cycling. A residual out-of-plane compressive strain was observed in the 1200A Nb film after …
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Minimizing electron optical aberrations
… deals with topics of aberration reduction in high voltage ("""" 100 k V) electron optical instruments, especially used for lithography (SCALPEL) and high resolution electron microscopy (HREM). Since the invention by Berger and Gibson [1) in 1989, SCALPEL (SCattering with Angular Limitation in …
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Synthesis of organically capped and water soluble metal sulfide semiconductor nanoparticles
… synthesized using a hybrid solution based high temperature colloidal route in the presence of organic surfactants as both stabilizers and crystal growth modifiers. The structure and morphology of the as-prepared metal sulfide nanoparticles were characterized by X-ray diffraction (XRD), …
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Visualization and simulation of defect structures in the B2 phase of NiAl
… in agreement with the experimental results of high resolution electron microscopy. This deviation was also found to increase Peierls stress.
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Characterization of III-V compound semiconductor heterostructures grown by metalorganic chemical vapor deposition
… much attention because of their application to high speed electronic and optoelectronic devices. For achieving these purposes, it is required to produce high quality samples with uniform layer thickness, no defects, and abrupt interfaces. For this metalorganic chemical vapor deposition (MOCVD) …
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The role of defects during precipitate growth in a Ni-45wt% Cr alloy
… lath except for atomic-scale structural ledges. High resolution electron microscopy (HREM) observations show the (12¯1)<sub>f</sub> habit plane is coherent and is a good matching interface. Based upon conventional transmission electron microscopy (TEM) observations, the orientation of the habit …
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Synthesis and Characterization of Nanocrystalline Niobium Aluminides by Laser Ablation Technique
… energy densities. By conventional transmission electron microscopy (TEM), we observe that the mean diameter of the nanocrystalline particles is 5 to 13 nm depending on the processing condition. Analysis of electron diffraction patterns suggests that the crystal structure of the majority of …
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Preparation and characterisation of mixed CeO2-Nb2O5-Bi2O3 nanoparticles
… especially on the nanoscale. Using high resolution electron microscopy (HRTEM), powder X-ray diffraction (PXRD), electron dispersive X-ray spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) as analytical tools, the structures of the nanoparticles in this system have been …
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Microstructure and Electronic Structures of Er-Doped Si Nano-particles Synthesized by Vapor Phase Pyrolysis
Si nanoparticles are new prospective optoelectronic materials. Unlike bulk Si cry-stals, Si nanoparticles display intriguing room-temperature photoluminescence. A major challenge in the fabrication of Si nanoparticles is the control of their size distribution. The rare-earth element Er has unique …
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Single nanocrystal microscopy and spectroscopy unveils hidden mechanistic information in cation exchange
… smaller than the diffusion lengths of ions or electrons, and optical/electronic properties that are highly sensitive to small perturbations are some of the unique features of nanocrystals. However, heterogeneity often shrouds these unique features. Each individual nanocrystal is different from …
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In-situ electron imaging of oxidation and reduction of rutile (TiO2) nanocrystals and interaction with palladium
… and interfaces, the catalytic reactions are highly dependent on the oxide surface structure and the interface with metal nanoparticles. Further, the oxides undergo the oxidation and reduction reactions as environment changes, the oxide surface structure also evolves dynamically during …
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Specific and non-specific interactions on carbon material surfaces.
… surfaces were characterised using X-ray Photoelectron Spectroscopy (XPS), which gives a quick and direct quantitative measure of the external surface composition. This technique, which has not yet been extensively employed in detailed adsorption studies, is a promising alternative to …
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Modeling mechanical properties – linking atomistics to continuum
… twins in the microstructure (as unveiled by electron backscatter diffraction and transmission electron microcopy) serve to enhance the atomic scale energetics in the form of slip characteristics. Using molecular dynamics simulations, various slip transfer mechanisms at the coherent twin …
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Exploring the Cephalopod Brain: Towards Mapping the First Whole Brain Connectome and Whole Animal Projectome of a Pygmy Squid
… all studied invertebrates. They possess large, highly centralised brains for processing sensory information, higher cognitive functioning, motor control, and feeding. Cephalopods are known for their ability to solve problems in unique ways, displaying idiosyncrasies in prey/predator behaviours, …