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Electrolyte electroreflectance study of TiO2 films modified with metal nanoparticles

Published online by Cambridge University Press:  31 January 2011

A. I. Kulak ,
A. I. Kokorin  and
D. V. Sviridov
A. I. Kulak*
Affiliation:
Institute of General and Inorganic Chemistry, Belarusian Academy of Sciences, Surganov St. 9, Minsk 220072, Belarus
A. I. Kokorin
Affiliation:
Institute of Chemical Physics, Russian Academy of Sciences, Kosygin St. 4, 117977 Moscow B-334, Russia
D. V. Sviridov
Affiliation:
Institute for Physico-Chemical Problems, Belarusian State University, Leningradskaya St. 14, 220050 Minsk, Belarus
*
a)Address all correspondence to this author.
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Abstract

Electrolyte electroreflectance (EER) has been used as an in situ probe for determining the distribution of energy states at the surface of naked and metal-modified TiO2 film in contact with aqueous solution. The surface modification of polycrystalline TiO2films by electrodeposition of fine (a few nanometers in size) metal particles has been shown to result in the appearance of surface states with an energy of approximately 2.15 eV for Cu, 2.40 eV for Pd, 2.50 and 2.30 eV (two peaks in the EER spectrum) for Pt, and 2.65 eV for Ag (the energy values are measured versus valence band edge of TiO2). The important role of metal-induced surface states in the enhancement of charge exchange between conduction band of semiconductor oxide and metal islets has been demonstrated using the electrocatalytic oxidation of boron hydride as a model reaction.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 8 , August 2001 , pp. 2357 - 2361
Copyright
Copyright © Materials Research Society 2001

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References

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