Photoinduced oxidation of an organic adsorbate was examined on an atomically flat surface of titanium dioxide by scanning tunneling microscopy combined with macroscopic analysis of desorbed products. The rate of oxidation was coupled with limited surface mobility of photoexcited electrons, and thereby spatially modulated on the surface exposed to oxygen gas. The dimension of the modulations as small as a few lattice constants of the oxide demonstrates that photoexcited electrons are localized to this extent on the surface covered by adsorbed chemicals.
Revised: December 3, 2004 |
Published: July 29, 2004
Citation
Uetsuka H., H. Onishi, M.A. Henderson, and J.M. White. 2004.Photoinduced Redox Reaction Coupled with Limited Electron Mobility at Metal Oxide Surface.Journal of Physical Chemistry B 108, no. 30:10621-10624.PNNL-SA-40953.