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 20 of 49 for “"Scanning Transmission Electron Microscopy (STEM)"”.
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Scanning transmission electron microscopy (STEM) and X-ray absorption spectroscopy (XAS) investigations of catalytic systems
… X-ray absorption spectroscopy (XAS) and scanning transmission electron microscopy (STEM) or spherical aberration-corrected STEM (Cs-STEM). Although the majority of the work focuses on γ-Al2O3 supported nanoparticles because of their industrial importance for fuel production, several other …
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A Theoretical and Experimental Investigation of the Physical and Chemical Properties of Solid Nanoscale Interfaces
… are invaluable tools for understanding the systems at hand. To this effect, we use density functional theory (DFT) with the inclusion of van der Waals (vdW) interactions to study the effect of long-range interactions on the adsorption characteristics of various organic molecules (i.e. benzene, …
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Low Temperature Growth and Characterization of ZnO Nanostructures
A large factor in the decision of using solar systems over readily available fossil fuels and other energy production methods is the upfront cost of solar systems. Therefore a potentially low cost energy harvesting device has been proposed in the form of a hybrid organic-inorganic thermoelectric …
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Structure, conformational dynamics and formation of large amyloids: the case of alpha-synuclein fibrils
… magnetic resonance (NMR) experiments with scanning transmission electron microscopy (STEM) to obtain atomic level structural information of the alpha-synuclein (AS) fibrils and the mechanism of their formation; We first investigated the effect of protein deuteration and 1H decoupling …
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Structural and chemical characterization of complex nanomaterials at atomic resolution
… using X-ray absorption spectroscopy (XAS) and scanning transmission electron microscopy (STEM) revealed non-bulk-like behavior. Anomalous, temperature-dependent structural dynamics were characterized in the form of negative thermal expansion (NTE) and abnormal levels of disorder. To examine a …
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The effects of chemical composition, solidification rate, and homogenization on the intermetallic particle microstructure of AA8XXX aluminum alloys for battery foil applications
… particularly those based on the Al-Fe-Si system, show promise due to their improved strength. However, their intermetallic particle (IMP) microstructure needs to be understood for optimal performance. This research investigates the impact of chemical composition, cooling rate, and homoge- …
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Three-dimensional electronic resistivity mapping of solid electrolyte interphase and anode active material in lithium-ion batteries
… current state-of-the-art graphite anodes. In systems featuring both C and Si anodes, electronic resistivity of the solid-electrolyte interphase (SEI) layer is a critical factor for preventing continuous electrolyte decomposition reactions at the electrode/electrolyte interface. Moreover, the …
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Chemistry of airborne particles from metallurgical processing
… and energy dispersive spectrometry with both scanning electron microscopy (SEM-EDS) and scanning transmission electron microscopy (STEM-EDS). Other methods for properly characterizing particles were discussed. In the analysis, less than 10% of the mass of fume particles for various types of …
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Quantitative High-angle Annular Dark Field Scanning Transmission To Electron Microscopy For Materials Science
Scanning transmission electron microscopy (STEM) has been widely used for characterization of materials; to identify micro- and nano-structures within a sample and to analyze crystal and defect structures. High-angle annular dark field (HAADF) STEM imaging using atomic number (Z) contrast has …
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An investigation of high-k materials in metal-insulator-metal capacitor structures
… properties of a hafnium silicate material system in MIM capacitors with sputtered aluminium electrodes. A conduction mechanism study was performed and an investigation of the dielectric reliability was carried out using the time dependent dielectric breakdown methodology. The material was …
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Synthesis, Characterization and Activity of Palladium Catalysts on the Dual Support of Cerium and Aluminum Oxides
… temperature programmed reduction (TPD), scanning transmission electron microscopy (STEM), and X-ray photoelectron spectroscopy (XPS). The activity of the catalysts for methane combustion was measured in a fixed-bed flow reactor by flowing a gas mix (0.98 vol % methane, 4.01 vol % and …
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Single atom imaging with time-resolved electron microscopy
Developments in scanning transmission electron microscopy (STEM) have opened up new possibilities for time-resolved imaging at the atomic scale. However, rapid imaging of single atom dynamics brings with it a new set of challenges, particularly regarding noise and the interaction between the …
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Egyptian Blue Pigment: An Examination of Effects on Luminescence from the Partial Replacement of Cu with Mg, and the Optimization of Atomic Imaging to Prevent Sample Damage
… of copper with magnesium. Analyses including scanning electron microscopy (SEM), electron dispersive spectroscopy (EDS), and Raman spectroscopy were performed. It was found that magnesium trends towards sodium-rich phases, forms clumps of entirely different phases, and does not itself …
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Design of stable nanostructure configurations in ternary alloys
… to the design of multicomponent nanostructured systems. In contrast to the simplicity of a binary system where not many topological possibilities are accessible, multicomponent nanostructured systems are shown to occupy a vast space where the large majority of interesting configurations will be …
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Preparation and characterization of doped lead zirconate titanate Pb(Zr<sub>x</sub>Ti<sub>1-x</sub>)O₃ films
… PZT films was determined by in-situ hot-stage transmission electron microscope (TEM) and compared with those of bulk ceramics. Lattice distortion and phase transformation were determined by x-ray diffraction (XRD). Microstructure of the films was characterized by using optical microscopy, …
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Electrical contacts on two-dimensional transition metal dichalcogenide semiconductors
… interfaces through high resolution cross-section scanning transmission electron microscopy (STEM) observations of the atomic structure, X-ray photoelectron microscopy (XPS) to analyze the chemical environment, and electrical transport measurements to extract the Schottky barrier heights for …
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Multivariate Analysis for Scanning (Transmission) Electron Diffraction
Scanning electron microscopy (SEM) and scanning transmission electron microscopy (STEM) are powerful and versatile techniques for materials science research. The technologies of beam control, aberration correction, signal collection, and data processing have all improved in recent years, leading to …
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Carbon fiber surface treatments for improved adhesion to thermoplastic polymers
… of carbon fibers was examined by x-ray photoelectron spectroscopy (XPS). The surfaces of carbon fibers after anodization in NaOH and H₂SO₄ were examined by scanning transmission electron microscopy (STEM). angular dependent XPS, ultraviolet (UV) absorption spectroscopy of the anodization …
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Investigation of acid/base interactions in adhesion
… interactions in adhesive phenomena. The model systems investigated were representative of real substrates and soft, viscoelastic adhesives where, in one case, favorable acid/base interactions were possible which were not possible in the other. Inverse gas chromatography (IGC) and Infrared …
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Stress Corrosion Cracking of a Transformation Induced Plasticity Fe39Mn20CO20Cr15Si5Al1 High Entropy Alloy
… dispersive spectroscopy (EDS) in high-resolution scanning transmission electron microscopy (STEM). Under a constant load experiment within the elastic regime (26% of yield strength), the passivation film formed exhibited differences in thickness and chemical composition. The passivation film …
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