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Influence of Dipolar Fields on the Photochemical Reactivity of Thin Titania Films on BaTiO 3 Substrates
Author(s) -
Burbure Nina V.,
Salvador Paul A.,
Rohrer Gregory S.
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01168.x
Subject(s) - ferroelectricity , reactivity (psychology) , dipole , materials science , substrate (aquarium) , thin film , photochemistry , chemical physics , chemical engineering , nanotechnology , optoelectronics , chemistry , dielectric , organic chemistry , engineering , oceanography , pathology , geology , medicine , alternative medicine
The photochemical properties of TiO 2 films supported on BaTiO 3 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 TiO 2 surface in patterns that correspond to the underlying domain structure of BaTiO 3 . 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.