Preparation of nanoporous TiO2 film with large surface area using aqueous sol with trehalose

The precursor solutions containing TiO2 sol for nanoporous films were prepared by hydrolyzing titanium(IV) isopropoxide and adding trehalose dihydrate. The porous and thick TiO2 film was prepared by dip-coating technique on glass substrate and heating at 500 degreesC. The maximum thickness of the film prepared by one-run dip-coating was ca. 740 nm. The film was composed of nanosized particles (10-20 nm) and pores (7 nm). The specific surface area and porosity of the film were 163 m(2)/g and 65%, respectively. (C) 2004 Elsevier B.V. All rights reserved.