A simple chemical route for the synthesis of inorganic semiconductor nanoparticles has been reported. CdS and ZnS nanoparticles have been synthesized using respective metal precursors and DMF as a stabilizing agent. The samples have been analysed by XRD, UV-VIS, fluorescence spectroscopy and TEM. Crystalline nature and particle size calculated from broad peaks in the diffraction pattern along with blue shift in absorption spectra confirms the formation of nanoparticles with the particle size less than 10 nm. Illumination of these semiconductor colloids generates holes and electrons and the recombination of charge carriers is accompanied by emission of light which is observed in fluorescence spectra. TEM micrograph also reveals the nanosized particles of CdS and ZnS. Impedance analysis of the samples was carried out to reveal the variation of impedance with frequency at room temperature. These results shows the capacitive admittance associated with the nanoparticles and hence nanostructure CdS and ZnS can have potential applications in the electronics as nano-tuned devices in which resonant frequency can be adjusted by controlling the size and shape of the nanoparticles.