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Cobalt-doped ZnO nanowires on quartz: Synthesis by simple chemical method and characterization

Vempati, Sesha and Shetty, Amitha and Dawson, P and Nanda, Karunakar and Krupanidhi, SB (2012) Cobalt-doped ZnO nanowires on quartz: Synthesis by simple chemical method and characterization. In: Journal of Crystal Growth, 343 (1). pp. 7-12.

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Official URL: http://dx.doi.org/10.1016/j.jcrysgro.2012.01.015

Abstract

The synthesis of cobalt-doped ZnO nanowires is achieved using a simple, metal salt decomposition growth technique. A sequence of drop casting on a quartz substrate held at 100 degrees C and annealing results in the growth of nanowires of average (modal) length similar to 200 nm and diameter of 15 +/- 4 nm and consequently an aspect ratio of similar to 13. A variation in the synthesis process, where the solution of mixed salts is deposited on the substrate at 25 degrees C, yields a grainy film structure which constitutes a useful comparator case. X-ray diffraction shows a preferred 0001] growth direction for the nanowires while a small unit cell volume contraction for Co-doped samples and data from Raman spectroscopy indicate incorporation of the Co dopant into the lattice; neither technique shows explicit evidence of cobalt oxides. Also the nanowire samples display excellent optical transmission across the entire visible range, as well as strong photoluminescence (exciton emission) in the near UV, centered at 3.25 eV. (C) 2012 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article is belongs to Elsevier Science.
Keywords: ROOM-TEMPERATURE FERROMAGNETISM;THIN-FILMS;RAMAN-SPECTROSCOPY;OPTICAL-PROPERTIES; NANOCRYSTALS;GROWTH; NANOPARTICLES;LUMINESCENCE;DEPENDENCE;DEPOSITION
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 14 Aug 2012 07:45
Last Modified: 14 Aug 2012 07:46
URI: http://eprints.iisc.ernet.in/id/eprint/44515

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