Influence of Dipolar Fields on the Photochemical Reactivity of Thin Titania Films on BaTiO3 Substrates

doi:10.1111/j.1551-2916.2006.01168.x

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Wiley InterScience

Journal of the American Ceramic Society

Volume 89 Issue 9, Pages 2943 - 2945

Published Online: 23 Jun 2006

Published on behalf of the American Ceramic Society (ACerS)

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Influence of Dipolar Fields on the Photochemical Reactivity of Thin Titania Films on BaTiO₃ Substrates

Nina V. Burbure ¹ , Paul A. Salvador ¹ and Gregory S. Rohrer ¹ ^* ^†

¹ Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213-3890

^†Author to whom correspondence should be addressed. e-mail: gr20@andrew.cmu.edu

P. Gouma—contributing editor

This work was supported by the National Science Foundation under grant DMR-0412886.

^*Member, American Ceramic Society.

ABSTRACT

The photochemical properties of TiO₂ films supported on BaTiO₃ were investigated to test the hypothesis that dipolar fields from a ferroelectric substrate would affect the reactivity of the supported film. Photochemical reaction products were formed on the TiO₂ surface in patterns that correspond to the underlying domain structure of BaTiO₃. As the film thickness increases from 10 to 100 nm, the titania more effectively screens the ferroelectric field, and the pattern of reaction products is obscured. It is concluded that dipolar fields from the ferroelectric substrate influence charge carrier transport in the film and spatially localize the reaction products.

Manuscript No. 21579. Recevied March 16, 2006; approved April 23, 2006.

DIGITAL OBJECT IDENTIFIER (DOI)

10.1111/j.1551-2916.2006.01168.x About DOI