However,
Wen et al. found as-prepared TiO2 nanowires prepared by a solvothermal
method to be composed of pure anatase phase [16], while
Yoshida et al. found that Na-free TiO2 nanowires were transformed
into TiO2 (B) nanowires at 300–500 C, and converted into the anatase
phase at 600–800 C while maintaining their original shape