“…In recent years, TiO 2 NTs are the most extensively studied material due to their unique electronic and optical properties, which can be applied in photocatalyst, biosensor, dye-sensitized solar cells and other applications [1][2][3][4][5]. Many methods, such as anodization [6][7][8], template technique [9], hydrothermal process [10][11][12], and soft chemical process [13] have been used to prepare TiO 2 NTs.…”