Modified NiS nano particles were prepared by mixing MTTF(dimethylthiotetrathiafulvalenyldithiolato) with NiS nanoparticles in alcoholic solution. IR and ESR results show the radical properties of the modified NiS. Material with m (NiS) m (MTTF)=20020 has a conductivity of 4 3×10 -2 S/cm.