Biography
Biography: Mehdi Anwar
Abstract
Zinc oxide (ZnO) is a unique wide bandgap biocompatible material system exhibiting both semiconducting and piezoelectric properties that grows in a diverse group of nanostructure morphologies. Bulk ZnO has a bandgap of 3.37 eV that corresponds to emissions in the ultraviolet (UV) spectral band. Highly ordered vertical arrays of ZnO nanowires (NWs) have been grown on substrates including silicon, SiO2, GaN, and sapphire using a metal organic chemical vapor deposition (MOCVD) growth process. Co-axial core-shell nanostructures demonstrating unique properties with enhanced detectability of chemical species have been grown. Structural and optical properties of the grown vertically aligned ZnO NW arrays characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) will be presented and discussed. We will introduce the growth of horizontal ZnO nanowires and present the state-of-the-art technology in the fabrication of memristors – the fourth circuit element. A discussion on the operation of memristors using the concept of conductive filament formation supported by both measurement of I-V and modeling will follow.
