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Acoustic enhancement of surface reactions

Published online by Cambridge University Press:  09 May 2019

Yasunobu Inoue*
Affiliation:
The University of Tokyo, Japan; yasinoue@chemsys.t.u-tokyo.ac.jp
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Abstract

This article focuses on the acoustic-wave enhancement of chemisorption and surface reactions. Acoustic waves generated by a piezoelectric phenomenon on ferroelectric crystals by the application of radio frequency electric power produce periodic lattice distortions at the surface. The effects of surface acoustic waves (SAWs) and the resonance oscillation (RO) of bulk acoustic waves on thin films of metals or metal oxides are described herein. Both SAWs and RO can modify the work functions of thin Ag, Au, or Pd films, and this effect is highly dependent on the surface structures. These changes in the work function can, in turn, affect the adsorptive characteristics of the metals as well as surface reactions and properties such as catalysis. The importance of periodic lattice displacement vertical to the surface is examined in this article, and the acoustic-wave enhancement of metal and metal oxide surfaces as a means of tuning electronic states and chemical properties is discussed.

Information

Type
Acoustic Processes in Materials
Copyright
Copyright © Materials Research Society 2019 

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