“…Among these oxides, TiO 2 has received particular attention due to its good stability, environmental friendliness, and interesting semiconducting property. Various PANi-TiO 2 nanocomposites have been prepared by using chemical polymerization or electrochemical polymerization of aniline in the presence of TiO 2 nanocolloidals, and have found applications in electrochromic devices [11], p-n heterojunction diodes [12], rectifier [13], gas sensor [14], high piezoresistivity [15], electrorheological response [16], cathode electrode in rechargeable battery [17], and photoelectrochemical devices [5,6,11,18]. PANi-TiO 2 nanocomposites were usually prepared in the form of thin film, powder, sphere [19,20], or tube [21].…”