Synthesis from zinc oxalate, growth mechanism and optical properties of ZnO nano/micro structures

Raj, Justin C and Joshi, RK and Varma, KBR (2011) Synthesis from zinc oxalate, growth mechanism and optical properties of ZnO nano/micro structures. In: Crystal Research and Technology, 46 (11). pp. 1181-1188.

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Abstract

We report the synthesis of various morphological micro to nano structured zinc oxide crystals via simple precipitation technique. The growth mechanisms of the zinc oxide nanostructures such as snowflake, rose, platelets, porous pyramid and rectangular shapes were studied in detail under various growth conditions. The precursor powders were prepared using several zinc counter ions such as chloride, nitrate and sulphate along with oxalic acid as a precipitating agent. The precursors were decomposed by heating in air resulting in the formation of different shapes of zinc oxide crystals. Variations in ZnO nanostructural shapes were possibly due to the counter ion effect. Sulphate counter ion led to unusual rose-shape morphology. Strong ultrasonic treatment on ZnO rose shows that it was formed by irregular arrangement of micro to nano size hexagonal zinc oxide platelets. The X-ray diffraction studies confirmed the wurzite structure of all zinc oxide samples synthesized using different zinc counter ions. Functional groups of the zinc oxalate precursor and zinc oxide were identified using micro Raman studies. The blue light emission spectra of the various morphologies were recorded using luminescence spectrometer. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Publication:	Crystal Research and Technology
Publisher:	John Wiley & Sons
Additional Information:	Copyright of this article belongs to John Wiley & Sons.
Keywords:	nanomaterials;precipitation technique;SEM;counter ions; fluorescence
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	21 Dec 2011 09:41
Last Modified:	23 Dec 2011 09:36
URI:	http://eprints.iisc.ac.in/id/eprint/42616

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