Local control of ZnO nanorods growing on au surface with three-electrode microstructure

Local control of ZnO nanorods growing was realized through applying different external electric-fields on three-electrode microstructure with top coplanar cathode and anode in pair and a bottom gate. The site-selective growth of ZnO nanorods consists of DC method and AC method. In DC control method, under proper DC voltages applied on three electrodes respectively, ZnO nanorods only grow on the cathode. In AC control method, when an AC electric field at megahertz is applied on top two electrodes (cathode and anode) while a DC voltage is applied onto the bottom electrode (gate), ZnO nanorods will grow on and between the opposite ends of the cathode and anode electrode-pair which corresponds with the simulation results of electric field.