“…Nanostructures are widely used in numerous technological app1ications, because of their 1D structure with high crystallinity, high surface area-tovolume ratio, and preferred orientation [3,4]. ZnO nanostructures have unique properties, such as wide and direct band gap (3.37 eV), large exciton binding energy (60 meV) at room temperature [5], high electron mobility, high transparency, and high thermal conductivity [6]. It is an important kind of technological semiconductor due to its characterized optical, electrical, and piezoelectrical properties, which can be commonly used in optoelectronic, sensors, piezoelectric devices, field emission, luminescence, nanogenerators and photovoltaic devices [7,8].…”