Mesoporous Anatase TiO2 Films: Use of Ti K XANES for the Quantification of the

PAULA C ANGELOMÉ; LEANDRO ANDRINI; MAURICIO E CALVO; FELIX REQUEJO; SARA A BILMES; GALO SOLER-ILLIA

JOURNAL OF PHYSICAL CHEMISTRY C

ACS

Lugar: Washington; Año: 2007 vol. 111 p. 10886 - 10893

1932-7447

Mesoporous titania thin films with accessible porosity and anatase structure were synthesized on conductiveglass or silicon substrates. Ti K-edge XANES was used to assess Ti local coordination. Analysis of thepre-edge region permitted accurate quantification of the degree of crystalline nature of the inorganic wallsupon thermal treatment. The substrate has a marked effect: film crystallization takes places at temperatures100 °C lower in the crystalline Si, with respect to conductive glass. Accordingly, remarkable photocatalyticproperties are found in well-crystallized mesoporous titania deposited onto conductive silicon.