Preparation of TiO_2 Thin Films Using Inorganic Peroxo Titanic Complex and Autoclaved Sols as Precursors

摘要

A new sol-gel method was introduced to prepare titanium oxides (TiO_2) photocatalytic thin films using peroxide (H_2O_2) and titanyl sulfate (TiOSO_4) as raw materials. The TiOSO_4 solution was precipitated by adding ammonia solution, then peptized with 30% H_2O_2 solution to get a yellow, stable, neutral, and transparent liquid (peroxo titanic complex sol). When the peroxo titanic complex sol was autoclaved above 80°C for 2h, it changed to a stable, semitransparent sol containing needle-like, ultra-fine anatase crystals less than 20nm in diameter. Titanium oxide (anatase) films used for photocatalysis can be prepared on substrates by a dip-coating technique using peroxo titanic complex and autoclaved sols.