Atomic Structures of Metallic and Semiconducting Nanocrystals by Coherent Electron Diffraction
Huang, Weijie
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https://hdl.handle.net/2142/82819
Description
Title
Atomic Structures of Metallic and Semiconducting Nanocrystals by Coherent Electron Diffraction
Author(s)
Huang, Weijie
Issue Date
2008
Doctoral Committee Chair(s)
Zuo, Jian-Min
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
The third application of the single-particle diffraction technique is to measure the temperature-dependent structures of individual nanocrystals. Again, Au nanocrystals were studied for this experiment. Experimentally, we recorded diffraction patterns from the same Au nanocrystals at different temperatures. From the diffraction data, we found that the coefficient of thermal expansion (CTE) of TiO2-supported Au nanocrystals is size dependent: the CTE is positive for nanocrystals larger than 7 nanometers in diameter and negative for the smaller nanocrystals. From the diffraction intensity, we also extracted through modeling the mean square displacement of the surface atoms of the Au nanocrystals as a function of temperature, and found that surface atoms have a significantly larger vibration amplitude than the interior atoms.
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