Abstract
SnO2 nanoparticles were synthesized by co-precipitation method using different solvent media (Methanol:Water: 100:0; 80:20; 60:40; and 0:100). X-ray diffraction (XRD) patterns showed highly crystalline single phase tetragonal structure, with predominant (110) plane in all samples. High resolution transmission electron microscopy (HR-TEM) images indicated the decrease in the particle size of nanoparticles with an increase in methanol to water ratio. The Raman shifts revealed that with increase in the water content as solvent, the intensity of A1g and B2g Raman modes decreases, indicating the distortion in crystal structure, which is in agreement with HR-TEM results. Fourier transform infrared (FTIR) spectroscopy spectra confirmed SnO stretching mode and also complemented Raman spectroscopy results. The optical band gap of SnO2 decreased from 3.66eV to 3.54eV with a decrease in methanol to water solvent ratio, thereby implying that the optical properties of these materials are affected by the synthesis medium, used during synthesis.
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