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Synthesis, luminescence properties and EPR investigation of hydrothermally derived uniform ZnO hexagonal rods

Reddy, Jagannatha A and Krishna, Hari R and Nagabhushana, BM and Kokila, MK and Nagabhushana, H and Shivakumara, C and Chakradhar, RPS (2015) Synthesis, luminescence properties and EPR investigation of hydrothermally derived uniform ZnO hexagonal rods. In: SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, 139 . pp. 262-270.

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Official URL: http://dx.doi.org/ 10.1016/j.saa.2014.11.088

Abstract

One-dimensional (1D) zinc oxide (ZnO) hexagonal rods have been successfully synthesized by surfactant free hydrothermal process at different temperatures. It can be found that the reaction temperature play a crucial role in the formation of ZnO uniform hexagonal rods. The possible formation processes of 1-D ZnO hexagonal rods were investigated. The zinc hydroxide acts as the morphology-formative intermediate for the formation of ZnO nanorods. Upon excitation at 325 nm, the sample prepared at 180 degrees C show several emission bands at 400 nm (similar to 3.10 eV), 420 nm (similar to 2.95 eV), 482 nm (similar to 2.57 eV) and 524 nm (similar to 2.36 eV) corresponding to different kind of defects. TL studies were carried out by pre-irradiating samples with gamma-rays ranging from 1 to 7 kGy at room temperature. A well resolved glow peak at similar to 354 degrees C was recorded which can be ascribed to deep traps. Furthermore, the defects associated with surface states in ZnO nano-structures are characterized by electron paramagnetic resonance. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Keywords: Hydrothermal; Hexagonal rods; Photoluminescence; Thermo luminescence; Electron paramagnetic resonance
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Depositing User: Id for Latest eprints
Date Deposited: 20 Apr 2015 06:48
Last Modified: 20 Apr 2015 06:48
URI: http://eprints.iisc.ac.in/id/eprint/51217

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