IFLP   13074
INSTITUTO DE FISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
Mesoporous Anatase TiO2 Films: Use of Ti K XANES for the Quantification of the Nanocrystalline Character and Substrate Effects in the Photocatalysis Behavior
Autor/es:
PAULA C. ANGELOMÉ; LEANDRO ANDRINI; MAURICIO E. CALVO; FELIX G. REQUEJO; SARA A. BILMES; GALO J. A. A. SOLER-ILLIA
Revista:
JOURNAL OF PHYSICAL CHEMISTRY
Editorial:
American Chemical Society
Referencias:
Lugar: Washington; Año: 2007 vol. 111 p. 10886 - 10893
ISSN:
0022-3654
Resumen:
Mesoporous titania thin films with accessible porosity and anatase structure were synthesized on conductive glass or silicon substrates. Ti K-edge XANES was used to assess Ti local coordination. Analysis of the pre-edge region permitted accurate quantification of the degree of crystalline nature of the inorganic walls upon thermal treatment. The substrate has a marked effect: film crystallization takes places at temperatures 100 °C lower in the crystalline Si, with respect to conductive glass. Accordingly, remarkable photocatalytic properties are found in well-crystallized mesoporous titania deposited onto conductive silicon.