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Oxidation and reduction of rough and flat Au surfaces

Title
Oxidation and reduction of rough and flat Au surfaces
Authors
Lim D.C.Kim Y.D.
Ewha Authors
김영독
Issue Date
2006
Journal Title
Applied Surface Science
ISSN
0169-4332JCR Link
Citation
vol. 253, no. 5, pp. 2984 - 2987
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Very recently, we have shown that the oxidation pattern of very small (<0.7 nm in particle height) and larger Au nanoparticles are dissimilar, i.e. lager particles form Au(III) species upon atomic oxygen exposures, whereas this was not found for the smaller Au nanoparticles. In the present work, we found that the oxidation pattern of a flat Au surface is analogous to those of the larger Au nanoparticles, whereas a rough surface shows a similar oxidation pattern as those of the smaller particles. This result confirms that an increase of the number of undercoordinated atoms of smaller nanoparticles should be responsible for different oxidation patterns. The oxygen species formed on flat Au surfaces can readily react with CO to CO2, whereas the oxygen species of the rough Au surface is mostly inert to the CO-oxidation, also in agreement with the results for supported Au nanoparticles. © 2006 Elsevier B.V. All rights reserved.
DOI
10.1016/j.apsusc.2006.05.051
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
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