Enzymatically Synthesized Conducting Polyaniline

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• 作者：Wei Liu ; Jayant Kumar ; Sukant Tripathy ; Kris J. Senecal ; and Lynne Samuelson
• 刊名：Journal of the American Chemical Society
• 出版年：1999
• 出版时间：January 13, 1999
• 年：1999
• 卷：121
• 期：1
• 页码：71 - 78
• 全文大小：185K
• 年卷期：v.121,no.1(January 13, 1999)
• ISSN：1520-5126

文摘

A novel strategy for the enzymatic synthesis of a water-soluble, conducting polyaniline (PANI)/sulfonated polystyrene (SPS) complex is presented. The enzyme horseradish peroxidase (HRP) is used topolymerize aniline in the presence of a polyanionic template, sulfonated polystyrene. The synthesis is simple,and the conditions are mild in that the polymerization may be carried out in a 4.3 pH buffered aqueous solution,with a stoichiometric amount of hydrogen peroxide and a catalytic amount of enzyme. UV-visible absorption,FTIR, GPC, elemental analysis, and conductivity measurements all confirm that the electroactive form ofPANI, similar to that which is traditionally chemically synthesized, is formed and complexed to the SPS. Thereversible redox activity of the polyaniline displays a unique hysteresis loop with pH change. Cyclic voltammetrystudies show only one set of redox peaks over the potential range of -0.2 to 1.2V, which suggests that thePANI/SPS complex is oxidatively more stable. The conductivity of the complex is found to increase with themolar ratio of PANI to SPS. Conductivities of 0.005 S/cm are obtained with the pure complex and may beincreased to 0.15 S/cm after additional doping by exposure to HCl vapor. This enzymatic approach offersunsurpassed ease of synthesis, processability, stability (electrical and chemical), and environmental compatibility.