In-Situ Chemical Synthesis, Microstructural, Morphological and Charge Transport Studies of Polypyrrole-CuS Hybrid Nanocomposites

Hybrid nanocomposites (HNCs) of polypyrrole (PPy) and CuS were synthesized by an in situ chemical polymerization method. The HNCs were prepared by varying the CuS nanoparticles weight percentage (10-40%) in PPy matrix. The XRD and FESEM characterization indicated the uniform distribution of CuS nanoparticles in PPy matrix. The XRD pattern revealed the presence of hexagonal CuS peaks overlapped with amorphous PPy pattern. Williamson Hall method was employed to estimate intrinsic strain in HNCs. FTIR spectrum revealed the shifting of 1025 cm(-1)peak toward higher wavenumber, indicating insertion of CuS nanoparticles in PPy. The room temperature electrical conductivity of PPy is found to be increased from 1.15 x 10(-1) to 3.70 S/cm as the content of CuS nanoparticles increases up to 40 wt% in HNCs. To explore the charge transport mechanism in HNCs,the conductivity was measured in the temperature range of 300-15 K. The measured conductivity data was analyzed with the help of Arrhenius model and 3d Mott's variable range hopping (VRH) model in the temperature range of 35-300 K. The approximate values of Mott's parameters at 300 K such as the density of states at Fermi level, average hopping distance and average hopping energy of HNCs were estimated as similar to 4x10(24) cm(-3)eV(-1), similar to 1.7 angstrom and similar to 10 meV respectively.