The present work has been carried out with the aim to synthesize tin oxide decorated reduce graphene oxide nanocomposite (SnO
2/RGO-Nc) via in-situ synthesis process and the influence of RGO loading on structural, optical, thermal and dielectric properties of SnO
2 has been discussed. The XRD, FESEM coupled with EDX elemental mapping, TEM, FTIR, Raman and XPS results reveal that the SnO
2 nanoparticles have been successfully incorporated onto the RGO sheets. The reduction in the energy gap of the composite sample as compared to SnO
2 measured from the Tauc’s relation can be attributed to strong coupling between RGO and SnO
2 NPs. Thermogravimetric analysis (TGA) shows improved thermal stability of the SnO
2/RGO-Nc. From the dielectric measurements, it is observed that the dielectric constant and dielectric loss decreases as frequency of applied field increases. AC conductivity of all samples increases as applied frequency increases which follows Jonscher’s power law. All composite samples show better conductivity as compared to SnO
2. This is due to the formation of continuous conductive pathway between SnO
2 and RGO sheets. Further high dielectric constant, low loss and high ac conductivity have been observed at optimum loading of RGO in SnO
2/RGO2-Nc as compared to other composite samples which is due the percolation effects. The impedance analysis exhibits only one semicircle for SnO
2 and SnO
2/RGO composite which suggests that the involvement of grain boundaries dominated over the grain contribution.
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