Novel Synthesis and Properties of Conducting Polymers

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Composites of LiMn_2O_4 and polypyrrole were successfully synthesized in nanotubules, and nanotubules composites were found to possess very high activities as the electrode materials for lithium secondary batteries.The nanotubule composite electrodes were prepared using a commercially available alumina membrane which has cylindical pores (200nm, diameter) of 20x10^<10> pores/cm^2 as a template. First, Li Mn_2O_4 was synthesized in the pores and then pyrrole was polymerized in the pores using the oxide as an oxidizing agent.The nanotubules composite of polypyrrole and LiMn_2O_4 showed the greater performances as a cathode active material for lithium secondary battery than that of a conbentional LiMn_2O_4 thin film. This enhanced performances was mostly indebted to a high specific surface area of the nanotubules electrode and to the function of polypyrrole as a conducting matrix. The effectiveness of this approach has been demonstrated also for other composites such as polyaniline and V_2O_5 and polythiophene and carbon.The nanotubules of polypyrrole was found to work as an excellent matrix for immobilizing enzymes at a high concentration. The array of nano-capsuled enzyme worked as a high-sensitive and-selective enzyme sensor.The conclusion is derived from this international joint project that the composites formation of conducting polymers with other materials such as metal oxides and enzymes is useful as the means of developing novel functions, and the nano-structuring of these composites is an effective way to enhance thir performance.