Influence of calcination temperature on the microstructure of porous TiO_2 film

摘要

To obtain porous TiO_2 film, the precursor sol was prepared by hydrolysis of Ti isopropoxide and then complexed with trehalose dihydrate. The porous TiO_2 film was fabricated by dip-coating technique on glass substrates using this solution. The TiO_2 film was calcined at 500 °C. The maximum thickness of the film by one-run dip-coating was ca. 740 nm. The film was composed of nanosized particle and pore. The porosity of the TiO_2 film was increased by the addition of trehalose dihydrate to the sol. The porous TiO_2 films were calcined at various temperatures. The effects of the calcination temperature on the microstructure of the porous TiO_2 film were investigated. The porous film prepared from sol containing trehalose still kept the porous structure for calcination at 950 °C. The phase transition temperature from anatase to rutile of the film was shifted from 650 to 700 °C by trehalose addition to the sol.