Files in this item



application/pdf3314793.pdf (4MB)Restricted to U of Illinois
(no description provided)PDF


Title:Atomic Structures of Metallic and Semiconducting Nanocrystals by Coherent Electron Diffraction
Author(s):Huang, Weijie
Doctoral Committee Chair(s):Zuo, Jian-Min
Department / Program:Materials Science and Engineering
Discipline:Materials Science and Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Engineering, Materials Science
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.
Issue Date:2008
Description:221 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008.
Other Identifier(s):(MiAaPQ)AAI3314793
Date Available in IDEALS:2015-09-25
Date Deposited:2008

This item appears in the following Collection(s)

Item Statistics