Electrolyte electroreflectance study of TiO2 films modified with metal nanoparticles

Citation
Ai. Kulak et al., Electrolyte electroreflectance study of TiO2 films modified with metal nanoparticles, J MATER RES, 16(8), 2001, pp. 2357-2361
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS RESEARCH
ISSN journal
08842914 → ACNP
Volume
16
Issue
8
Year of publication
2001
Pages
2357 - 2361
Database
ISI
SICI code
0884-2914(200108)16:8<2357:EESOTF>2.0.ZU;2-#
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 m etal-modified TiO2 film in contact with aqueous solution. The surface modif ication of polycrystalline TiO2 films by electrodeposition of fine (a few n anometers in size) metal particles has been shown to result in the appearan ce of surface states with an energy of approximately 2.15 eV for Cu, 2.40 e V for Pd, 2.50 and 2.30 eV (two peaks in the EER spectrum) for Pt, and 2.65 eV for Acr (the energy values are measured versus valence band edge of TiO 2). The important role of metal-induced surface states in the enhancement o f 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.