Photochemistry on surfaces. 4. Influence of support material on the photochemistry of an adsorbed dye

Gopidas, K. R. ; Kamat, Prashant V. (1989) Photochemistry on surfaces. 4. Influence of support material on the photochemistry of an adsorbed dye Journal of Physical Chemistry, 93 (17). pp. 6428-6433. ISSN 0022-3654

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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100354a030

Related URL: http://dx.doi.org/10.1021/j100354a030

Abstract

The absorption and emission properties of rose bengal have been characterized on the surfaces of SiO2, Al2O3, and TiO2 particles. The intrinsic properties of these oxide supports play an important role in effecting and controlling the photochemistry of the adsorbed dye. On the Al2O surface, a biphotonic photoionization process leads to the production of semioxidized dye. However, a charge injection from the excited dye into the conduction band dominates on the TiO2 particles. Steady-state photolysis indicates a rapid photodegradation of the dye only on the surface of TiO2. The diffuse reflectance laser flash photolysis experiments which elucidate the mechanism of photochemical processes on these oxide supports are described.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:62052
Deposited On:16 Sep 2011 04:05
Last Modified:16 Sep 2011 04:05

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