This class of membranes exhibits a high photocatalytic activity. Owing to the overlapping and interpenetra-tion of the flexible and long nanofibers, the as-formed membranes also show good mechanical strengths and flexible characteristics. Thus these membranes are useful for flexible devices and can be easily transferred onto other substrates for further device investiga-tion. Conventional nanofiber membranes are fabricated by the filtration method [2], layer-by-layer (LbL) assembly method [6],or solvent casting method [7]. All these methods are multiple-step processes because they need to synthesize nanofibers firstly and then to organize them into membranes. Currently, researchers also urge the preparation of nanofiber membrane via the single-step, self-assembly route because it is simple and cost-effective.