One-dimensional (1-D) core/shell nanostructures have attracted exceptionally great interest due to their potential applications in energy conversion (e.g., solar cells & light-emitting diode), photocatalysis and environmental sciences (e.g., removal/degradation of pollutants)[1].The multicomponent feature, the peculiar heterostructures and the built-in interfaces therein make these 1D core/shell nanostructures not only multifunctional but also possessing fascinating novel physical & chemical properties[2,3], which are of great importance in both the fundamental researches and the practical applications.