Photoluminescence, Raman and conductivity studies of CaSO4 nanoparticles Online publication date: Sun, 24-Sep-2017
by Yashaswini; C. Pandurangappa; N. Dhananjaya; M.V. Murugendrappa
International Journal of Nanotechnology (IJNT), Vol. 14, No. 9/10/11, 2017
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(SO2-4) 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 SO2-4 stretching vibrations. The Raman spectrum exhibits an intense peak at 1010 cm-1 associated with the SO2-4 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.
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