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

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• 作者：A. Jagannatha Reddy^a ; M.K. Kokila^b ; H. Nagabhushana^c ; ^{bhushanvl@rediffmail.com} ; S.C. Sharma^c ; J.L. Rao^d ; C. Shivakumara^e ; B.M. Nagabhushana^f ; R.P.S. Chakradhar^g ; ^{sreechakra72@yahoo.com}
• 关键词：A. Nanostructures ; B. Chemical synthesis ; C. Electron microscopy ; D. Luminescence ; D. Crystal structure
• 刊名：Materials Chemistry and Physics
• 出版年：2012
• 期刊代码：58_02540584
• 类别：ms
• 出版时间：16 April, 2012
• 卷：133
• 期：2-3
• 页码：876-883
• 文件大小：1531 K

摘要

Zn_(1鈭?em>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 鈮?#xA0;2.0 with a sextet hyperfine structure (hfs) besides a weak signal at g 鈮?#xA0;4.13. The signal at g 鈮?#xA0;2.0 with a sextet hyperfine structure might be due to manganese impurity where as the resonance signal at g 鈮?#xA0;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 (E₂) modes at low and high frequencies at 100 and 435 cm^鈭? in Fe doped samples. These modes broaden and disappear with increase of Fe dopant concentration. TL measurements of 纬-irradiated (1-5 kGy) samples show a main glow peak at 368 掳C at a warming rate of 6.7 掳Cs^鈭?. 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.