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Oxygen-Induced Reversible Structural Change of Supported fine Silver Particles Observed by In Situ Optical Absorption and X-ray Diffraction

Published online by Cambridge University Press:  28 February 2011

Akihisa Yanase ,
Hiroshi Komiyama  and
Kazunobu Tanaka
Akihisa Yanase
Affiliation:
The University of Tokyo, Dept. of Chemical Engineering, Hongo, Bunkyo-ku, Tokyo 113, Japan
Hiroshi Komiyama
Affiliation:
The University of Tokyo, Dept. of Chemical Engineering, Hongo, Bunkyo-ku, Tokyo 113, Japan
Kazunobu Tanaka
Affiliation:
Electrotechnical Laboratory, Umezono, Tsukuba-shi, Ibaraki 305, Japan
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Abstract

In situ measurements of optical absorption and x-ray diffraction for small supported silver particles were performed under defined atmospheres at temperatures below 723 K. We found, for the first time, reversible changes both in optical absorption spectrum and lattice parameter of silver particles against the cyclic exchange of ambient gases between 5% H2/He and 1% 02/He. The present data indicate that the adsorption of oxygen results in a reduction in surface stress of silver particles, leading to a change in the shape of particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 31
Copyright
Copyright © Materials Research Society 1990

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References

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