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Description
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 |
Degree: | Ph.D. |
Genre: | Dissertation |
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 |
Type: | Text |
Language: | English |
Description: | 221 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2008. |
URI: | http://hdl.handle.net/2142/82819 |
Other Identifier(s): | (MiAaPQ)AAI3314793 |
Date Available in IDEALS: | 2015-09-25 |
Date Deposited: | 2008 |
This item appears in the following Collection(s)
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Dissertations and Theses - Materials Science and Engineering
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Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois