ZnO – Page 4 – TechConnect Briefs

Strain Driven Growth of Zinc Oxide Nanowires on Sapphire: Controlling Horizontal vs. Standing Growth

Nikoobakht B., Eustis S., National Institute of Standards and Technology, US

Recently we showed large scale fabrication of field-effect transistors from horizontal ZnO nanowires (NWs) on a-plane sapphire. We are interested in understanding the factors that induce the unique growth direction of horizontal ZnO NWs and [...]

Aluminium-Doped ZnO Films and Nanowires by a Modified Chemical Vapor Deposition Technique

Pung S.Y., Choy K.L., University of Nottingham, UK

ZnO has unique properties such as wide-bandgap (3.37eV) and large exciton binding energy (60meV) at room temperature. These properties made ZnO a promising material for short wavelength photonic devices for examples, light emitting diode (LED) [...]

Phonon-assisted tunnelling mechanism of conduction in SnO2 and ZnO nanowires

Ohlckers P., Pipinys P., Vestfold University College, NO

Non-linear temperature-dependent current-voltages characteristics of SnO2 nanowires measured by Ma et al [2005 Solid State Commun 130 313] and single ZnO nanorods from {J.Y. Park et al., 2006 Nanotechnology 17 1255] are explained by the [...]

Synthesis of uniform ZnO nanowire arrays over a large area

Wang C-H, Yang J., Shum K., Salagaj T., Ren Z.F., Tu Y., First Nano, US

It has been found that Zinc oxide (ZnO) nanowires have great potential in many applications. Currently, the most commonly used method to grow ZnO nanowires is to use the vapor transport method. The morphology of [...]

Structure-Property Correlations in ZnO Tetrapods and Spheres prepared by Chemical Vapour Synthesis

Bacsa R., Bacsa W., Verelst M., Dexpert J., Bacsa R., Bacsa W., Serp P., CEMES CNRS Univ Toulouse, FR

ZnO is a direct band gap semiconductor that finds applications in varistors and arrestors. Efficient luminescence in the UV of high purity nanocrystalline ZnO nanoparticles (20-50nm) is used in medicine and in the cosmetic industry [...]

Electroluminescence of ZnO Nanowire/p-GaN Heterojunction Light Emitting Diodes

Wang X., Cole J.J., Jacobs H.O., University of Minnesota, US

ZnO nanowire/p-GaN heterojunction light emitting diodes (LEDs) were fabricated by growing ZnO nanowire vertical arrays in aqueous solution on Mg-doped p-GaN films. Diode-like, rectifying I-V characteristics were recorded at room temperature and a “current crowding” [...]

Synthesis and Characterizations of ZnO Nanorods Arrays for Solar Cell and Chemical Sensor Applications

Lupan O., Chow L., University of Central Florida, US

Synthesis of nanorod based solar cells and sensors are quickly directed towards developing alternative, lightweight, flexible nanodevices for wide area of commercial applications. Many research papers has been published, in recent years, in the area [...]

Effect of Reaction Temperature on the Structural and Optical Properties of Zno Nanocrystals

Parra-Palomino A., Sotomayor C., Perales-Perez O., Singhal R., Voyles P., Tomar M.S., University of Puerto Rico, PR

The present research addressed the size-controlled synthesis of ZnO nanocrystals at different temperatures. In order to study systematically the dependence of crystal size with synthesis conditions in ethanol, stable suspensions of these nanocrystals were produced [...]

Low-Temperature Synthesis and Characterization of Fe-Doped ZnO Nanocrystals

Parra-Palomino A., Singhal R., Perales-Perez O., Tomar M.S., University of Puerto Rico, PR

We present here our results on synthesis and characterization of bare and Fe-doped ZnO nanocrystals by a modified sol-gel method, which does not require annealing of the samples. Metal acetate solutions in 2-ethylhexanoic acid were [...]

Determination of micro-structural properties with x-ray absorption fine structure

Han S.-W., Park S.H., Yu H.-J., Jeong E.-S., Kim S-H, Kim Y.J., Kim S-H, Kim Y.J., Yi G.-C., Chonbuk National University, KR

We studied the structural properties of ZnO nanostructures with x-ray absorption fine structure (XAFS) to understand the growth mechanism of vertically aligned ZnO nanorods of the average diameter of 50 - 150 nm. The orientation-dependent [...]