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 12 of 12 for “"4D-STEM"”.
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Strain relaxation in TEM lamellae probed by 4D-STEM: from projected strain to dynamical-diffraction-based reconstruction of composition
Scanning Transmission Electron Microscopy (STEM) provides the spatial resolution necessary to determine material composition from strain measurements on the nanoscale, but it relies on thin, electron-transparent lamellae. In such lamellae, the tetragonal distortion established during epitaxial …
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Studying magnetic and 3D atomic structure using 4D scanning transmission electron microscopy
… scanning transmission electron microscopy (4D-STEM), where a convergent electron beam is scanned over the sample and a diffraction pattern is collected at each scan position. A 4D-STEM dataset offers more information than conventional imaging modes like annular dark field STEM, but the …
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Electron diffuse-scattering fluctuation and correlation analysis in complex face-centered-cubic alloys via four-dimensional scanning transmission electron microscopy
… (H/MEA) and austenitic steels. This interest stems from their exceptional combination of high strength and toughness over a broad temperature range. A key factor believed to significantly influence the mechanical properties of these alloys is the formation of chemical short-range ordering …
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Exploring the Structural and Optical Response of Halide Perovskites Using High-Energy Electrons
… under an electron and X-ray beam using 4D-scanning transmission microscopy (4D-STEM), the development of cathodoluminescence (CL-SEM) to probe the optical properties of halide perovskites at the nanoscale, and the development of strategies to push the limits of 4D-STEM towards *in-situ* …
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Underlying deformation behavior of medium/high entropy alloys using advanced electron imaging and diffraction
… electron nanodiffraction (SEND), also known as 4D scanning TEM or 4D-STEM. We use 4D-STEM to acquire position-resolved nanodiffraction patterns at the nanometer spatial resolution. The diffraction dataset are data-mined to extract local strain, orientation, and phase information. Taking …
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Fundamental Understanding and Functionality of Silicon Oxycarbide
… batteries, and advanced optics. In the SiOC system, SiO2 nanoclusters can be removed through the etching process, to create nanopores for increasing the surface area. By introducing the SiO2-forming filler (perhydropolysilazane) into SiOC, more SiO2 nanodomains with an average size of 1.72 nm …
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
… nanodiffraction (SEND) or four-dimensional (4D) scanning transmission electron microscopy (STEM) or 4D-STEM, is emerging as a powerful way to provide information in both real space and reciprocal space at the same time based on electron nanodiffraction. This thesis aims to develop novel data …
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Quantitative control and measurement of nanoparticle dynamics in liquid-phase transmission electron microscopy
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01
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Probing interfacial electronic structure in quantum materials using stem cathodoluminescence spectral imaging
… drive the superconductivity. These two systems motivated the structure-property relation study here that is simultaneously structure aware and optically sensitive at atomic to nanoscopic scale. This thesis starts with the development of scanning transmission electron microscopy (STEM) with …
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Nanoscale defect engineering and mapping for cathode materials of multivalent ion batteries
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01
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Cryogenic scanning transmission electron microscopy of quantum materials
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Characterization of phase and structural evolution in battery materials using advanced electron imaging and diffraction methods
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-12-01