Controlled Formation of Highly Organized Mesoporous Titania Thin Films: from Mesostructured Hybrids to Mesoporous Nano-anatase TiO2.

CREPALDI, E. L.; GALO JUAN DE AVILA ARTURO SOLER ILLIA; GROSSO, D.; RIBOT, F.; CAGNOL, F.; SANCHEZ, C.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY

Año: 2003 vol. 125 p. 9770 - 9786

0002-7863

In this paper, we report the complete synthesis and characterization procedures to generate highly organized and oriented mesoporous titania thin films, using poly(ethylene oxide) (PEO)-based templates. Controlled conditions in the deposition, postsynthesis, and thermal treatment steps allow one to tailor the final mesostructure (2D hexagonal, p6m, or 3D cubic, Im3m). Various techniques were used to determine the time evolution of the mesostructure. Spectroscopic techniques (UV/vis, 17O NMR) and EXAFS/XANES have been used to follow the chemical changes in the Ti(IV) environment. Crossing these techniques spanning all ranges permits a complete description of the chemistry all the way from solution to the mesostructured metal oxide. A critical discussion on all important chemical and processing parameters is provided; the understanding of these features is essential for a rational design and the reproducible construction of mesoporous materials.17O NMR) and EXAFS/XANES have been used to follow the chemical changes in the Ti(IV) environment. Crossing these techniques spanning all ranges permits a complete description of the chemistry all the way from solution to the mesostructured metal oxide. A critical discussion on all important chemical and processing parameters is provided; the understanding of these features is essential for a rational design and the reproducible construction of mesoporous materials.