Acoustic wave effects of thickness-extensional mode resonance oscillation on catalytic activity for CO oxidation of thin TiO2 and NiO films depositedon a z-cut LiNbO3 single crystal

The effects of lhickness-extensiona1 mode resonance oscillation (TERO) on t he catalytic activity for CO oxidation of thin TiO2 and NiO films deposited on a z-cut LiNbO3 (z-LN) single crystal were investigated. TERO at 3 W cau sed 4-7-fold increases in the catalytic activity of TiO2/z-LN and NiO/z-LN and remarkable decreases in the activation energy of the reaction. Vertical lattice displacement by TERO was decreased remarkably by the presence of t he metal oxides. The catalyst activation is due to the interactions of TERO with the carriers in the semiconductor metal oxides. (C) 2001 Elsevier Sci ence B.V. All rights reserved.