导电聚合物具有优异的导电性能和生物相容性,是制备细菌印迹传感器的关键材料。利用循环伏安法在玻碳电极表面一步原位聚合制备了一种新型掺杂有黑磷(BP)的聚吡咯复合薄膜(PPy/BP)。采用扫描电镜(SEM)、X射线光电子能谱(XPS)等手段表征其表面形貌和化学成分,通过循环伏安曲线和交流阻抗图谱研究PPy/BP的电化学性能,并考察其环境稳定性及防污性能。结果表明:PPy/BP呈现出平滑、疏松、纳米颗粒状的形貌,其界面阻抗仅为PPy的15%,说明BP掺杂大大提高了PPy的导电能力。PPy的包覆有效地保护了易被氧化的黑磷,室温放置15d,PPy/BP的阻抗几乎不变,说明PPy/BP具有良好的环境稳定性;PPy/BP对BSA的非特异性吸附很少,意味着PPy/BP具有良好的防污性能,因此,PPy/BP是一种适用于构建细菌印迹传感器的优异复合材料。
Owing to their excellent electrical conductivity and biocompatibility,conductive polymers are one of the key materials for preparing bacterial imprinting sensors.A new type of polypyrrole composite film doped with black phosphorus (PPy/BP) was prepared by one-step in-situ polymerization on the surface of glassy carbon electrode by cyclic voltammetry.SEM and XPS were used to characterize its surface morphology and chemical composition.The electrochemical performance,environmental stability and antifouling performance of PPy/BP were investigated by cyclic voltammetry curve and AC impedance spectroscopy.The results showed that PPy/BP presented smooth,loose,nano-particle morphology,and its interface impedance was only 15% of PPy,indicating that BP doping greatly improved the conductivity of PPy.The PPy coating effectively protected the BP that was easily oxidized.After 15 days at room temperature,the impedance of PPy/BP was almost unchanged,indicating that PPy/BP had good environmental stability.PPy/BP had very little non-specific adsorption to BSA,meaning that PPy/BP had good antifouling performance.The above results indicated that PPy/BP was promising composite material suitable for constructing bacterial imprinting sensors.
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基金资助
国家自然科学基金(31972772);上海自然科学基金项目(11ZR415400)
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