Abstract
Polyaniline–Co (PANI–Co) was synthesised using peroxydisulphate as an oxidant in a solution containing 0·1 mol L–1 aniline and 0·5 mol L–1 HCl and adequate CoCl2.6H2O in the applied magnetic field. The electron paramagnetic resonance spectrum displayed that there were unpaired electrons in PANI–Co, the spin density of which was 6·903 6 1019 spins/g. The conductivity of PANI–Co synthesised under magnetic field was 0·728 S cm–1. The relationship between magnetisation and applied magnetic field showed that the PANI–Co had soft ferromagnetic property at room temperature. The saturation magnetisation and the coercive force of the PANI–Co were 6·6 emu g–1 (electromagnetic unit per gram) and 48 Oe, respectively. The UV-Vis and Fourier transform infrared spectra implied that there was the interaction between Co2+ and PANI chains but the structure of backbone chains of PANI–Co hardly changed compared with that of PANI. The results of cyclic voltammogram indicated that the ferromagnetic PANI–Co film was of excellent electrochemical activity.
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