基于碳纳米管/钯纳米粒子复合材料的电化学传感平台

Electrochemical biosensing platform based on palladium/carbon nanotubes nanocomposite

在碳纳米管存在下合成了直径2～10nm的钯纳米粒子,利用全氟磺酸盐聚合物Nafion溶解碳纳米管/钯纳米粒子复合物,构建了检测H2O2的电化学传感平台。循环伏安法证实所合成的钯纳米粒子在复合材料中保持了其电化学活性,该纳米复合物对H2O2具有催化能力。将葡萄糖氧化酶固定在碳纳米管/钯纳米粒子复合物修饰的玻碳电极上,制备了葡萄糖生物传感器,响应时间和检测限(S/N=3)分别为6s和3.0×10-5 mol/L。

Palladium nanoparticles with diameters of 2～10 nm were prepared and used in combination with multi-wall carbon nanotubes（CNT） for fabricating electrochemical sensors with remarkably improved sensitivity toward hydrogen peroxide.Nafion,a perfluorosulfonated polymer,was used to solubilize CNT and Pd nanoparticles to form a network that connected Pd nanoparticles to the electrode surface.Cyclic voltammetry confirmed that Pd nanoparticles keep their electroactivity in the nano-composites.With glucose oxidase（GOD） as a model enzyme,a glassy carbon electrode（GCE） based biosensor that responds even more sensitively to glucose than the GCE/GOD electrode modified by Pd nanoparticles or CNT alone was constructed.The response time and detection limit（S/N=3） of this biosensor was determined to be 6 s and 3.0×10-5 mol/L,respectively.