J.H. Lee, Y. Son, S.G. Lee
Pusan National University,
Keywords: anatase, TiO2, synthesis, nanoparticle
Summary:Titanium dioxide, TiO2, is one of the most widely used metal oxides with a broad range of applications including bio-separation, sensors, energy storage, solar cells, catalysis and photocatalysis. It is abundant and cheap, chemically stable and non-toxic, while having a relatively high photocatalytic activity. Therefore, TiO2 has been studied intensively and used as a photocatalyst in both fundamental research and practical applications such as coatings for self-cleaning surfaces as a photocatalyst for water splitting and as photoanodes in dye-sensitized solar cells. In this study, TiO2 nanoparticles were obtained from the aqueous TiCl4 solution, which was prepared by adding HCl solution in attempt to control its acidity, at 100–150 °C by changing reaction time. Pure anatase–type TiO2 particles with a size of less than 50 nm and the specific surface area of about 100~200 ㎡/g were obtained by heating the aqueous TiCl4 solution with not more than 2.0 M of Ti4+, in which the concentration of HCl is kept in the range of about 0.15 M to 2.00 M during reaction, at the temperature of not more than 120 °C within 5 h. The relationship between the phase content, physicochemical properties of products, and reaction parameters such as concentrations of HCl and titanium in aqueous solution, reaction temperature, and reaction time was discussed in this study.