Effect of different fuels on structural, thermo and photoluminescent properties of Gd 2O 3 nanoparticles

Dhananjaya, N and Nagabhushana, H and Nagabhushana, BM and Rudraswamy, B and Sharma, SC and Sunitha, DV and Shivakumara, C and Chakradhar, RPS (2012) Effect of different fuels on structural, thermo and photoluminescent properties of Gd 2O 3 nanoparticles. In: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 96 . pp. 532-540.

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Abstract

Gd 2O 3 nanoparticles (27-60nm) have been synthesized by the low temperature solution combustion method using citric acid, urea, glycine and oxalyl dihydrazide (ODH) as fuels in a short time. The structural and luminescence properties have been carried out using powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Raman, UV-Vis, photoluminescence (PL) and thermoluminescence (TL) techniques. The optical band gap values were estimated for as formed and 800°C calcined samples. The band gap values in as-formed and calcined samples were found to be in the range 4.89-5.59eV. It is observed that, the band gap values are lower for as-formed products and it has been attributed to high degree of structural defects. However, in calcined samples, structure becomes more order with reduced structure defects. Upon 270nm excitation, deep blue UV-band at �390nm along with blue (420-482nm), green (532nm) and red emission (612nm) was observed. The 390nm emission peak may be attributed to recombination of delocalized electron close to the conduction band with a single charged state of surface oxygen vacancy. TL measurements were carried out on Gd 2O 3 prepared by different fuels by irradiating with γ-rays (1kGy). A well resolved glow peak at 230°C was observed for all the samples. It is observed that TL intensity is found to be higher in for urea fuel when compared to others. From TL glow curves the kinetic parameters were estimated using Chen's peak shape method and results are discussed in detail. © 2012 Elsevier B.V.

Item Type:	Journal Article
Publication:	Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Publisher:	Elsevier
Additional Information:	Copyright for this article belongs to Elsevier
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	18 Sep 2012 07:26
Last Modified:	18 Sep 2012 07:26
URI:	http://eprints.iisc.ac.in/id/eprint/45027

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