Impedance spectroscopy and dielectric properties of cobalt doped CdS nanoparticles

► Comparative study of CdS with Co doped CdS nanoparticles. ► CdS and Co doped CdS nanoparticles have been synthesized by chemical route. ► Grain size is found to increase with cobalt doped CdS nanoparticles. ► Impedance value decreases for increase in temperature of CdS and Co doped CdS nanoparticles.