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Journal of Nanomaterials
Volume 2013 (2013), Article ID 480164, 9 pages
http://dx.doi.org/10.1155/2013/480164
Research Article

Optical Characterization and Growth Mechanism of Combination of Zinc Oxide Nanowires and Nanorods at Various Substrate Temperatures

Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India

Received 21 April 2013; Revised 23 July 2013; Accepted 7 August 2013

Academic Editor: Gong Ru Lin

Copyright © 2013 Poulami Ghosh and A. K. Sharma. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report on the growth of ZnO nanostructures on -type silicon substrate using pulsed laser deposition technique at substrate temperature ranging from room temperature to 600°C for one hour. We observe both rod- and wire-like structures with different dimensions at room temperature, 150°C, and 450°C substrate temperatures and only wire-like structures at 300°C and 600°C. These combinations of different shapes have been attributed to the initial growth of nanostructures (nucleation sites) on the surface obtained during the deposition for 20 minutes. The narrowing in the full-width-half-maximum of the peak corresponding to (002) plane of XRD is looked upon as another possible explanation. The blue shift of the peak at 396 nm observed in the photoluminescence is due to the quantum confinement. The intensity of (high) mode at 437 cm−1 increases indicating improvement in crystallinity with the substrate temperature.