Nickel Ferromagnetic Conductive Polyaniline Performance

1. Study on Synthesis and Characterization of Ferromagnetic Conducting PolyanilineFerromagnetic polyaniline were synthesized in a solution containing 0.1 mol dm-3 aniline, 0.5 mol dm-3 HCl and adequate NiCl2·6H2O at ambient temperature, using peroxydisulphate as an oxidant. The conductivities of the resulting products were in the magnitude order of 10-1~10-2 S cm-1. The results of electron paramagnetic resonance (EPR) spectra indicated that the PANI synthesized with NiCl2·6H2O for 8 hours had the narrowest line width (△H pp=1.96) and the maximum spin density (2.36×1020 spins g-1). The magnetization (M)–magnetic field (H) curves showed that the polyaniline was ferromagnetic behavior at room temperature. The PANI synthesized with NiCl2·6H2O for 8 hours had the largest saturation magnetization (Ms) of 0.050 emu/g. UV-vis and FTIR spectra showed that there was strong interaction between Ni2+ and PANI chains but the backbone chains of PANI were hardly changed compared with PANI synthesized without NiCl2·6H2O. Cyclic voltammogram results indicated that the PANI film synthesized with NiCl2·6H2O was of excellent electrochemical activity.2. Both Conducting and Ferromagnetic Polyaniline at Ambient TemperatureFerromagnetic polyaniline were synthesized in aniline and HCl with and without NiCl2·6H2O, using peroxydisulphate as an oxidant and horseradish peroxidase as a catalyst. The conductivity of the resulting product was about 10-1 S cm-1. The result of electron paramagnetic resonance (EPR) spectra indicated that there were unpaired electrons in PANI synthesized with NiCl2·6H2O and the spin density of the PANI was 1.09×1019 spins g-1, which was more than the PANI (1018 spins g-1) synthesized without NiCl2·6H2O. The magnetization (M)–magnetic field (H) curve showed that PANI synthesized with NiCl2·6H2O was of soft ferromagnetic behavior at about 300 K and its saturation magnetization (Ms) was 0.018 emu g-1 (electromagnetic unit per gram) and the coercive force (Hc) was about 55 Oe. UV-vis and FTIR spectra showed that there was strong interaction between Ni2+ and PANI chains but the backbone chains of PANI were hardly changed compared with PANI synthesized without NiCl2·6H2O.3. Synthesis and Characterization of Ferromagnetic Polyaniline with Conductivity in Applied Magnetic FieldFerromagnetic polyaniline (PANI) with conductivity were synthesized using peroxydisulphate as an oxidant and horseradish peroxidase as a catalyst in N'-a-hydroxythylpiperazine-N'-ethanesulfanic acid (HEPES) buffer solution containing aniline, HCl and NiCl2·6H2O in applied magnetic field. The result of EPR spectrum indicated that there were unpaired electrons in the resulting product, the spin density of which was 7.60×1019 spins g-1. The curve of magnetization (M)–magnetic field (H) showed that the PANI was of soft ferromagnetic behavior at about 300 K. The saturation magnetization (Ms) and the coercive force (Hc) of the PANI were 0.033 emu g-1 (electromagnetic unit per gram) and 5 Oe, respectively. UV-vis and FTIR spectra indicated that there was interaction between Ni2+ and PANI chains but the structure of backbone chains of PANI synthesized in the presence of magnetic field hardly changed when compared with PANI synthesized without NiCl2·6H2O.