Study of electrical properties of nickel doped SnO2 ceramic nanoparticles

Nickel doped tin oxide (Sn1−xNixO2, where x = 0, 0.05, 0.07 and 0.09) nanoparticles with sub-5 nm size were synthesized using sol–gel method. The structural and compositional analyses were carried out using XRD, FESEM and EDAX. Electrical properties were studied using dielectric and impedance spectroscopy at room temperature. XRD analysis indicated the formation of single phase rutile structure of all the samples. The particle size was observed to vary from 5 nm to 2 nm as the nickel content was increased. The XRD and EDAX results corroborated the successful doping of Ni in the SnO2 matrix. The dielectric constant ɛ′, ɛ″, loss tangent tan δ and ac conductivity σac were studied as a function of frequency and composition and the behaviour has been explained on the basis of Maxwell–Wagner model. Complex impedance analysis which was used to separate the grain and grain boundary contributions to the system suggests the dominance of grain boundary resistance in the doped samples.

Research highlightsWe understand that the study of electrical properties of Ni-doped SnO2 ceramic nanoparticles is a least explored area till now and we have, therefore, been motivated to take up this task. In this paper, we are reporting structural and electrical properties such as dielectric constant (ɛ), tangent loss (tan δ), ac conductivity (σac), real and imaginary part of impedance and Cole–Cole analysis of pure and Ni-doped SnO2 using XRD, SEM, dielectric and impedance spectroscopy.