Wang, Liang
(2005)
Dynamic Investigation of Cu50at%Au (001) Alloy Film Nano-oxidation by in situ UHV TEM.
Master's Thesis, University of Pittsburgh.
(Unpublished)
Abstract
Elucidating the oxidation mechanism of alloy has significant practical and theoretical impact. The addition of alloying elements could substantially alter the oxidation behavior of the base metal. The aims of this thesis research are to model alloy oxidation by investigating Cu-Au oxidation using an in situ ultra-high vacuum transmission electron microscopy (UHV-TEM). Cu-Au system was chosen because 1) Au does not form stable oxide at the reaction conditions, thus only Cu is expected to oxidize; and 2) Our extensive prior experiments of Cu nano-oxidation.The main findings of the research on Cu0.5Au0.5 (001) oxidation as compared to Cu (001) are: 1) segregation of gold atoms to the surface delays adsorption of oxygen and thus delays the nucleation (longer incubation time); 2) addition of gold enhances the nucleation by reducing nucleation activation energy (fast nucleation rate); 3) Oxide island growth is initially limited by surface oxygen diffusion. As oxide grows, a gold build-up zone forms around the oxide and hinders further growth by inhibits Cu supply to the reaction front; 4) Oxide grows slower due to the presence of gold.
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Details
| Item Type: |
University of Pittsburgh ETD
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| Status: |
Unpublished |
| Creators/Authors: |
|
| ETD Committee: |
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| Date: |
21 June 2005 |
| Date Type: |
Completion |
| Defense Date: |
21 March 2005 |
| Approval Date: |
21 June 2005 |
| Submission Date: |
11 April 2005 |
| Access Restriction: |
No restriction; Release the ETD for access worldwide immediately. |
| Institution: |
University of Pittsburgh |
| Schools and Programs: |
Swanson School of Engineering > Materials Science and Engineering |
| Degree: |
MSMSE - Master of Science in Materials Science and Engineering |
| Thesis Type: |
Master's Thesis |
| Refereed: |
Yes |
| Uncontrolled Keywords: |
2D growth; 3D growth; AFM; capture zone; self-limiting growth; STEM |
| Other ID: |
http://etd.library.pitt.edu/ETD/available/etd-04112005-180858/, etd-04112005-180858 |
| Date Deposited: |
10 Nov 2011 19:35 |
| Last Modified: |
15 Nov 2016 13:39 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/6984 |
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