用离子吸附法制备银／聚吡咯同轴纳米电缆

Fabrication of Ag/Polypyrrole(PPy) Coaxial Nanocables Through Ions Adsorption Method

以多元醇还原反应法制备出直径为40～50nm的纳米银线，采用醋酸铜水溶液对银纳米线表面进行处理，通过离子吸附在纳米银线表面吸附铜离子．以吸附在银纳米线表面上的铜离子作为活性单元，氧化吡咯单体聚合，制得Ag/PPy同轴纳米电缆．采用TEM，FTIR和XPS等表征手段对产物进行表征和检测，并通过表面增强拉曼光谱进一步证实产物中聚吡咯层紧密地吸附在银线表面．结果表明，利用醋酸铜作为氧化剂，通过离子吸附法制备的Ag/PPy同轴纳米电缆，可以在较大范围内有效地控制聚吡咯层厚度，避免银纳米线被刻蚀．

A new method for the fabrication of Ag/PPy coaxial nanocables based on the ion adsorption on the nanowires＇ surface was developed. The Ag nanowires（NWs） with uniform diameters of about 40-50 nm were obtained through polyol reduction with poly（vinylpyrrolidone） （PVP） as the capping agent. The Ag-NW was dispersed in the Cu （Ac）2 aqueous solution for the adsorption of Cu^2＋ on the surface of the Ag-NWs. The Cu^2＋ on the Ag-NW surface was then served as the active central to oxidize pyrrole monomer to PPy on the surface of Ag-NWs. The structures of the coaxial nanocables＇ of the final products were characterized by TEM, FTIR, Raman spectrum and XPS to study the composite of the finial product and the chemical environment of Cu^＋ .