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摘要: 采用层离/吸附和原位聚合相结合的方法合成了聚苯胺/氧化石墨复合材料（PAn/GO）。利用TEM、AFM、XRD、FTIR等方法对PAn/GO的结构和电化学性能进行了研究。以PAn/GO修饰炭糊电极为工作电极，采用方波伏安法（SWV）检测了单链小牛胸腺DNA(CTssDNA)和双链小牛胸腺DNA(CTdsDNA)。研究结果表明：PAn/GO为当量直径约60nm～70nm的扁球状纳米颗粒，这些纳米颗粒呈链状聚集，并具有电化学活性；聚苯胺(PAn)以双层平行排列的方式嵌入氧化石墨层间和包覆在氧化石墨表面两种形式与氧化石墨结合；PAn/GO修饰炭糊电极识别单链小牛胸腺DNA(CTssDNA)和双链小牛胸腺DNA(CTdsDNA)时的峰电位分别为90.99mV和18.00mV。Abstract: Polyaniline-intercalated graphite oxide (PAn/GO) composites were synthesized by a procedure similar to an exfoliation/adsorption followed by in situ polymerization. The microstructure and electrochemical activity of PAn/GO composite were investigated by TEM, AFM, XRD and FTIR. Calf thymus single-stranded DNA (CTssDNA) and double-stranded DNA (CTdsDNA) were indentified by square wave voltammograms (SWV) using PAn/GO composite modified carbon paste as a working electrode. Results show that the PAn/GO composite in an ellipsoidal shape and with AN equivalent diameter of 60-70nm, aggregates to form chains and possesses electrochemical activity. A portion of PAn was intercalated into GO by two parallel chains, and the other portion was coated on the surfaces of the GO. The SWV redox potentials of a PAn/GO composite modified carbon paste electrode in CTssDNA and CTdsDNA solutions are 90.99mV and 18.00mV respectively.
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