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Open Access Nano Express

Ultra violet sensors based on nanostructured ZnO spheres in network of nanowires: a novel approach

SS Hullavarad1*, NV Hullavarad1, PC Karulkar1, A Luykx2 and P Valdivia2

Author Affiliations

1 Office of Electronic Miniaturization, University of Alaska Fairbanks, Fairbanks, AK, 99701, USA

2 Center for Superconductivity Research, University of Maryland, College Park, MD, 20742, USA

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Nanoscale Research Letters 2007, 2:161-167  doi:10.1007/s11671-007-9048-6

Published: 3 March 2007

Abstract

The ZnO nanostructures consisting of micro spheres in a network of nano wires were synthesized by direct vapor phase method. X-ray Photoelectron Spectroscopy measurements were carried out to understand the chemical nature of the sample. ZnO nanostructures exhibited band edge luminescence at 383 nm. The nanostructure based ZnO thin films were used to fabricate UV sensors. The photoresponse measurements were carried out and the responsivity was measured to be 50 mA W−1. The rise and decay time measurements were also measured.

Keywords:
UV Sensor; Nano structures; Micro-spheres; Nanowire network; Rise/Decay time; Photoresponse; Photoluminescence