Metal–polymer nanocomposites based on Ni nanoparticles and polythiophene obtained by electrochemical method

Abstract

Polythiophene–nickel (PT–Ni) nanocomposites have been prepared by the electrochemical oxidative polymerization of thiophene in the presence of nickel nanoparticles. The metallic nickel nanoparticles were obtained by the chemical reduction of nickel chloride with hydrazine at 100–130°C. Poly(N-vinylpyrrolidone) (PVP) was used as protective agent in the synthesis of nickel nanoparticles. Transmission electron microscopy data revealed the particle size to be in the range 6–20nm. X-ray diffraction, scanning electron microscopy, thermal analysis, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were utilized to characterize the nanocomposites. XPS measurements for the PT–Ni nanocomposites showed that the nickel content varied between 0.43 and 1.3at.% in the PT–Ni nanocomposites. The electrical conductivity of the composites increased from 4.5×10−3Ωcm−1 to 1.25×10−2Ωcm−1 as the amount of nickel was increased from 0.43% up to 1.3%, polythiophene–Ni nanocomposites exhibiting a good electrical conductivity response.