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Showing 1 to 8 of 8 for “"nanodiffraction"”.
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Three-dimensional nanostructure determination based on scanning electron nanodiffraction
… high resolution and low-dose scanning electron nanodiffraction (SEND) to acquire diffraction patterns in the 3D reciprocal space, with the help of a special sample holder for large angle rotation. Grains are identified in the 3D real space based on the crystal orientation and the reconstructed …
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Investigating Chemical and Structural Heterogeneities of High-Voltage Spinel Cathode Material for Li-ion Batteries
… cathode synthesis. We utilize the X-ray nanodiffraction technique throughout this work, which provides high-resolution structural information. We develop a method to measure and relate lattice strain to phase distribution at the tens of nanometers scale. In Chapter 3, mapping lattice …
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Fluctuation Electron Microscopy Investigations of Medium Range Order in a-Silicon and a-Silicon:hydrogen Thin Films
… on the spatial extent of the medium range order. Nanodiffraction patterns are obtained using electron probes with a full width at half maximum between 1--4 nm. A convenient method of forming coherent nanoprobes has been developed where the probes are obtained by varying the condenser minilens …
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
… technique in TEM, called scanning electron 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 …
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Underlying deformation behavior of medium/high entropy alloys using advanced electron imaging and diffraction
… (TEM) methods, including scanning 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, …
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Energetic Considerations and Structural Characterization of Twinning in Nanowires
… out to analyze the structures of the nanowires. Nanodiffraction was used to demonstrate twinning is a general structural feature of the growth of gold nanowires growing in a <111> direction. A model was proposed to explain the conditions under which twinning is energetically favored during …
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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
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X-ray microscope performance enhancement through control architecture change
The goal of this thesis is to apply control algorithms to improve the performance of nanopositioning devices used on the beamline in Advanced Photon Source (APS) at Argonne National Laboratory (ANL). A prototype device, better known as the Early User Instrument (EUI) was the subject of this work. …