Title: Photoluminescence, Raman and conductivity studies of CaSO₄ nanoparticles

Authors: Yashaswini; C. Pandurangappa; N. Dhananjaya; M.V. Murugendrappa

Addresses: Department of Physics, B.M.S. Institute of Technology & Management, Bangalore – 560064, India ' Department of Physics, R.N.S. Institute of Technology, Bangalore – 560098, India ' Department of Physics, B.M.S. Institute of Technology & Management, Bangalore – 560064, India ' Department of Physics, BMS College of Engineering, Bangalore – 560092, India

Abstract: CaSO₄ nanoparticles have been synthesised by co-precipitation technique. Powder X-ray diffraction (PXRD) studies reveal that the as formed product is in hexagonal phase. The scanning electron microscopy (SEM) results reveal a nano wire and belt like morphology, and energy dispersive spectroscopy (EDS) confirmed the presence of elements in the sample. Fourier transform infrared (FTIR) spectroscopy shows a strong doublet at 658 cm^-1 and 600 cm^-1 owing to ν₄(SO^2-₄) bending vibrations. The band at 3798 cm^-1 and 3548 cm^-1 corresponds to -OH group, 2926 cm^-1 corresponds to C-H stretching bands, band centred at 1629 cm^-1 is associated with crystal H₂O molecule on CaSO₄ and 1149 cm^-1 corresponds to SO^2-₄ stretching vibrations. The Raman spectrum exhibits an intense peak at 1010 cm^-1 associated with the SO^2-₄ mode. Photoluminescence (PL) spectrum of the sample showed a prominent green emission band at 545 nm under the 276 nm excitation. The dielectric spectroscopic and AC conductivity have been studied in the range 100 Hz to 1 MHz in detail.

Keywords: co-precipitation; scanning electron microscopy; SEM; photoluminescence; CIE chromaticity Raman; AC conductivity; dielectric spectroscopy.

DOI: 10.1504/IJNT.2017.086768

International Journal of Nanotechnology, 2017 Vol.14 No.9/10/11, pp.845 - 858

Published online: 24 Sep 2017 *

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