Abstract
Pure and Mn-doped SnO2 nanoparticles are prepared by co-precipitation method. The structural analysis reveals the presence of tetragonal system of SnO2. Fourier transform infrared spectroscopy (FTIR) spectra of pure SnO2 show the occurrence of O-Sn-O vibrational mode at around 671 cm−1. It is observed that the wavenumber is shifted to lower region with the increase in Mn dopant concentration. As the Mn content is increased, a clear indication of red shift is observed in the UV-vis absorption spectra. From the scanning electron microscope (SEM) image, the surface morphology of the sample shows uniformly dispersed particles, which are spherical in shape. From dielectric studies, the dielectric constant suddenly drops to 0.5 × 106 Hz, and thereafter, it shows a constant behavior. Dielectric loss plot of the prepared samples exhibits a linear behavior at higher frequency region, which suggests the samples possess a lossless nature. The ac conductivity value drops linearly with the increase in dopant level. This is due to the particle size effect and screening effect caused by the impurities.
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