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Titanium dioxide, because of its unique optical, electrical and chemical attributes, is a widely studied material. It is well-known for its use in photocatalysis, gas sensors and dye sensitized solar cells and batteries. (Fujishima & Honda, 1972,Garzella et al., 2000,Meng et al., 2003,Ohko et al., 1998) Titanium dioxide (TiO2) was extensively studied for its applications in high performance photovoltaics. Now, the greatest challenge in TiO2-based photocatalysis is obtaining a highly efficient catalyst. Many efforts have been made to enhance the activity and it is found that the morphology is one of the important factors influencing the activity, which may lead to interesting shape-dependent properties. (Li et al., 2007) In various morphologies, the hierarchical 3D architectures have been regarded as the more interesting structures due to the greater number of active sites than other 2D or 1D architectures.(Wu et al., 2006,Hu et al., 2007) Therefore, Preparation of high-quality hierarchical TiO2 nanostructure of desired morphology is of great fundamental and technological interest. Up to now, various methods, including hydrothermal,(Sinha et al., 2009) solvothermal,(Zhu et al., 2009) vapor deposition methods, (Wu & Yu, 2004)as well as electrochemical approaches,(Zhang et al., 2010) have been used to synthesize the TiO2 materials with different morphologies and architectures, such as nanotubes,(Su et al., 2008) hollow nanospheres,(Li et al., 2006) nanofibers,(Pan et al., 2007) nanorods,(Xu et al., 2008) nanocolumn,(Li et al., 2008) and dandelion-structured spheres.(Bai et al., 2008) Though there are many effective ways to enhance the photocatalytic activity, this approach also has some disadvantage. In particular, direct fabrication of complex hierarchical nanostructures with controlled morphologies, crystalline orientations, grain size, and surface architectures is one of the most challenging topics because of their promising functions. To overcome the above inconvenience, many attempts have been made to effectively fabricate TiO2 photocatalysts, for example, by electrospun Nanofiber-based hierarchically organized TiO2 nanocomposite. Electrospinning is a process by which high static voltages are used to produce nano and microscale fibers, with the fiber diameter in the range from less than 10 nm to over several micrometers. The variety of materials and fibrous structures that can be electrospun allow for the incorporation and optimization of various functions to the nanofiber, either during

Au/TiO2 Hierarchical Nanofibers Heterostructure: Controllable Synthesis and Enhanced Photocatalytic Performances