The synthesis of zinc oxide(ZnO) nanowires is achieved by vapor phase transportation(VPT) method.The designed quartz tube,whose both ends are narrow and the middle is wider,is used to control the growth of ZnO nanowires.Dielectrophoresis(DEP) method is employed to align and manipulate ZnO nanowires which are ultrasonic dispersed and suspended in ethanol solution.Under the dielectrophoretic force,the nanowires are trapped on the pre-patterned electrodes,and further aligned along the electric field and bridge the electrode gap.The dependence of the alignment yield on the applied voltage and frequency is investigated.
A simple method is adopted to grow ZnO nanofibers laterally among the patterned seeds designed in advance on silicon substrate.The preparation of seed lattices is carried out by lithographing the metal zinc film evaporated on the substrate.A layer of aluminum is covered on the zinc layer to prevent the ZnO nanorods vertically growing on the top surface.After oxidation,the patterned ZnO/Al2O3 spots are formed at the sites for the horizontal growth of ZnO nanofibers by the vapor phase transportation(VPT) method using the zinc powders as source material.
