Structural, EPR, photo and thermoluminescence properties of ZnO:Fe nanoparticles

Reddy, Jagannatha A and Kokila, MK and Nagabhushana, H and Sharma, SC and Rao, JL and Shivakumara, C and Nagabhushana, BM and Chakradhar, RPS (2012) Structural, EPR, photo and thermoluminescence properties of ZnO:Fe nanoparticles. In: Materials Chemistry and Physics Mater Chem Phys, 133 (2-3). pp. 876-883.

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Abstract

Zn(1-x)Fe(x)O(1+0.5x) (x = 0.5-5 mol%) nanoparticles were synthesized by a low temperature solution combustion route. The structural characterization of these nanoparticles by PXRD, SEM and TEM confirmed the phase purity of the samples and indicated a reduction in the particle size with increase in Fe content. A small increase in micro strain in the Fe doped nanocrystals is observed from W-H plots. EPR spectrum exhibits an intense resonance signal with effective g values at g approximate to 2.0 with a sextet hyperfine structure (hfs) besides a weak signal at g approximate to 4.13. The signal at g approximate to 2.0 with a sextet hyperfine structure might be due to manganese impurity where as the resonance signal at g approximate to 4.13 is due to iron. The optical band gap E-g was found to decrease with increase of Fe content. Raman spectra exhibit two non-polar optical phonon (E-2) modes at low and high frequencies at 100 and 435 cm(-1) in Fe doped samples. These modes broaden and disappear with increase of Fe do pant concentration. TL measurements of gamma-irradiated (1-5 kGy) samples show a main glow peak at 368 degrees C at a warming rate of 6.7 degrees Cs-1. The thermal activation parameters were estimated from Glow peak shape method. The average activation energy was found to be in the range 0.34-2.81 eV. (C) 2012 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	Materials Chemistry and Physics Mater Chem Phys
Publisher:	Elsevier Science
Additional Information:	Copyright of this article is belongs to Elsevier Science.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	22 Aug 2012 04:53
Last Modified:	22 Aug 2012 04:56
URI:	http://eprints.iisc.ac.in/id/eprint/44457

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