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A hybrid electrochemical-thermal method for the preparation of large ZnO nanoparticles

Chandrappa, Kodihalli G and Venkatesha, Thimmappa V and Vathsala, Kanagalasara and Shivakumara, Chikkadasappa (2010) A hybrid electrochemical-thermal method for the preparation of large ZnO nanoparticles. In: Journal of Nanoparticle Research, 12 (7). pp. 2667-2678.

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A simple and efficient two-step hybrid electrochemical-thermal route was developed for the synthesis of large quantity of ZnO nanoparticles using aqueous sodium bicarbonate electrolyte and sacrificial Zn anode and cathode in an undivided cell under galvanostatic mode at room temperature. The bath concentration and current density were varied from 30 to 120 mmol and 0.05 to 1.5 A/dm(2). The electrochemically generated precursor was calcined for an hour at different range of temperature from 140 to 600 A degrees C. The calcined samples were characterized by XRD, SEM/EDX, TEM, TG-DTA, FT-IR, and UV-Vis spectral methods. Rietveld refinement of X-ray data indicates that the calcined compound exhibits hexagonal (Wurtzite) structure with space group of P63mc (No. 186). The crystallite sizes were in the range of 22-75 nm based on Debye-Scherrer equation. The TEM results reveal that the particle sizes were in the order of 30-40 nm. The blue shift was noticed in UV-Vis absorption spectra, the band gaps were found to be 5.40-5.11 eV. Scanning electron micrographs suggest that all the samples were randomly oriented granular morphology.

Item Type: Journal Article
Publication: Journal of Nanoparticle Research
Publisher: Springer
Additional Information: Copyright of this article belongs to Springer.
Keywords: Granular morphology; Hybrid electrochemical-thermal; Large ZnO;Nanoparticle preparation; TEM; X-ray diffraction; Synthesis method.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 08 Sep 2010 06:10
Last Modified: 19 Sep 2010 06:15
URI: http://eprints.iisc.ac.in/id/eprint/32024

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