Thermal effects on rapid microwave synthesized Co: ZnAl2O4 spinel nanoparticles

Menon, Samvit G and Choudhari, KS and Shivashankar, SA and Santhosh, C and Kulkarni, Suresh D (2017) Thermal effects on rapid microwave synthesized Co: ZnAl2O4 spinel nanoparticles. In: JOURNAL OF ALLOYS AND COMPOUNDS, 728 . pp. 1083-1090.

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Abstract

A rapid (10 min) microwave-assisted synthesis of CoxZn(1-x)Al2O4 nanoparticles using metal organic precursors is reported for the first time. The nanoparticles formed at 185 degrees C were phase-pure in the asprepared form with an average crystallite size of similar to 5 nm. Sample with x = 0.0025 showed intense photoluminescence (PL) emission and was used to study the effect of annealing temperature on the structural and optical properties. Annealing in air until 1200 degrees C gradually (i) increased the crystallite size to as much as 31 nm (ii) change of colour tone from colourless to blue which has been attributed to the diffusion of Co2+ in host lattice (iii) increase in intensity of Co2+ bands in the diffuse reflectance spectra (DRS). The emission spectra comprised of the broad T-4(1)(P-4)/(4)A(2)(F-4) spin allowed transition pertaining to tetrahedral Co2+ at similar to 649 nm whose intensity increased with annealing temperature. The crystal field splitting parameter (D-q) and the Racah parameter B, were calculated from the excitation spectra and the Tanabe-Sugano diagrams. The novelty of this work lies in the simplicity and swiftness of the microwaveassisted synthesis that can be extended to other ceramic phosphors suitable for lasing and sensing applications. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF ALLOYS AND COMPOUNDS
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Nov 2017 10:54
Last Modified:	01 Mar 2019 07:48
URI:	http://eprints.iisc.ac.in/id/eprint/58133

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