Transparent self-standing films of titanium-containing nanoporous silica

M. Ogawa, K. Ikeue, M. Anpo

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

Transparent self-standing films of titanium-containing (Ti/Si ratio of 1/50) silica-surfactant mesostructured materials, having a thickness of ca. 50 μm and a lateral size of a few centimeters, were synthesized by the solvent evaporation method from tetramethoxysilane, vinyltrimethoxysilane, titanium tetraisopropoxide, and octadecyltrimethylammonium chloride. The films were converted to titanium-containing nanoporous silica films by subsequent calcination in air at 550 °C, while their highly ordered mesostructures and macroscopic morphology were retained after the surfactant removal. Titanium-containing nanoporous silica films with hexagonal and cubic symmetry were obtained by changing the composition of the starting mixtures. The resulting materials possess a large surface area (ca. 900 m2/g) as evidenced by nitrogen adsorption/desorption isotherms. The titanium ions exist in the silica network as a tetrahedrally coordinated species. UV irradiation of the titanium-containing nanoporous silica film in the presence of CO2 and H2O led to the evolution of CH4 and CH3OH, indicating the photocatalytic reactivity of the present material.

Original languageEnglish
Pages (from-to)2900-2904
Number of pages5
JournalChemistry of Materials
Volume13
Issue number9
DOIs
Publication statusPublished - 2001

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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