Fabrication And Electrical Characteristics Test Of Nanowires And Its Application

This article provides a quick and easy, no template method, which use alternating current deposition with single crystal and polycrystalline structure of the gold nanowire. Various shapes of the gold nanowires can be achieved by controlling the power supply frequency, DC bias voltage, electrolyte concentration and other parameters in the experiment. The diameter of obtained single crystal and polycrystalline gold nanowires structure is in the 10 ~ 100 nm, and the aspect ratio is greater than 200. Through the fixed electrodes and probes growth methods, we obtained nanowire arrays and single nanowire, and choiced the uniform shape of nanowires for electrical characteristics test.Meanwhile, in order to improve contact characteristics between one-dimensional nanomaterials and the metal micro-electrode, we contact one-dimensional nanomaterials and metal micro-electrode system by selective electrodeposition, through the electrodeposition to assemble ZnO nanowires, carbon nanotubes and micro-electrode to develop a reliable and stable micro-sensing structure and obtain fast and economic metal overlaid process. The different conductivity of ZnO nanowires and metal electrodes can result in different cathode surface overpotential. Metal ions in low coverage power bath required the higher cathodic overpotential to restore, and under the appropriate electrodeposition conditions, metal ions can be achieved in the metal electrode surface where the potential is higher than other areas, and complete localized control of electrodeposition.A new type of hot-wire anemometer probe is presented, and the probe is based on macro-sized double walled carbon nanotube strands using a microfabrication process to assemble thermal element and electrodepositing nickel particles to improve the stability of sensitive structure. The CNTs thermal element possessed a larger temperature coefficient of resistance than PT100, which is about 0.3727%/K to 0.5601%/K in the temperature range from 293K to 393K. According to the heat balance principle, the velocity can be obtained by measuring the resistance of the CNTs with different velocity field under constant current mode. Compared with commercial anemometer, the CNT probe shows performance characteristics with the maximum sensitivity measured to be approximately 15.38%, and the measuring result is reversible.