Nanoscopic ZnO: Growth, Doping and Characterization; Final rept. 1 Oct 2006-30 Jun 2007

摘要

The authors have demonstrated the aqueous growth of ZnO nanorods on a wide variety of substrates, including Au, Al, Si, Pt, Ag, ITO, and silica. The rate of nucleation and the form of the crystals depends slightly upon the substrate. Additives can dramatically change growth behavior. The nanorods grow in the (1000) direction and are 0.1-10 m long. Short, squat rods are appropriate as MEMS actuators, and the authors are acquiring a nanoindenter to characterize their piezo-electric properties. Long, thin rods may be used as photovoltaic antennae, sensors, or field-effect transistors. They are in the process of testing the conductivity of these crystals by placing the crystal across a metallization pattern and contacting it. The metallization pattern provides the capability of making four-point contact. Integrity is ensured by the deposition of Pt using a focused ion beam. The surface of the ZnO will be passivated with Si3N4 and SiO2.