Abstract: A method for the mass production of nanostructures is provided. The method comprises introducing metal catalyst nanoparticles into a plurality of uniformly sized pores of mesoporous templates, distributing the templates containing the metal catalyst nanoparticles in a three-dimensional manner, and introducing a nanowire source into the pores of the templates to grow the nanowire source into nanowires along the length of the pores. Further provided are nanostructures produced by the method. The nanostructures have a uniform thickness. In addition, the nanostructures may have various shapes and can be controllably doped. The nanostructures can be applied to a variety of devices, including electronic devices, e.g., field effect transistors (FETs) and light-emitting diodes (LEDs), photodetectors, nano-analyzers, and high-sensitivity signal detectors for various applications, e.g., cancer diagnosis.