Nanotube-shaped TiO2 powder was synthesized by a digestion of the crystalline powder obtained from the heat treatment of the titanium hydroxide precipitates. The influence of the crystalline phase and the digestion temperature on the formation of the TiO2 nanotube was investigated. The powder digested at 150 degreesC for 12 h showed the highest specific surface area of 270 m(2)/g.