静电纺Ag-ZnO纳米复合纤维及无酶过氧化氢传感应用

Electrospun Ag-ZnO Composite Nanofiber for Non-Enzyme H₂O₂ Detection

摘要: 近年来，ZnO作为一种无酶传感材料受到广泛关注。本文以乙酸锌、硝酸银、聚丙烯腈和聚乙烯吡咯烷酮为前驱液，采用静电纺丝技术获得的纤维原丝经过煅烧得到Ag-ZnO纳米复合纤维。通过扫描电子显微镜和透射电子显微镜确定了样品形貌，采用X射线光电子能谱和X射线衍射方法分析样品的组成和晶体结构。循环伏安和电化学阻抗表明Ag-ZnO纳米纤维具有优异的导电性。以Ag-ZnO为修饰剂制备Ag-ZnO修饰玻碳电极对H₂O₂还原具有灵敏的催化响应。催化电流与H₂O₂浓度在1 × 10−5~4 × 10−3 M (R2 = 0.9992)范围内呈良好的线性关系，检测限达到0.3 × 10−6 M (S/N > 3)。Ag-ZnO纳米复合纤维在无酶过氧化氢传感方面具有选择性强、灵敏度高和稳定性好的性能。

Abstract: In recent years, ZnO has received extensive attention as a non-enzyme sensing material. In this paper, it is mainly on the Ag-ZnO nanocomposite fibers, which were fabricated by electrospinning the mixture containing zinc acetate, silver nitrate, polyacrylonitrile and polyvinylpyrrolidone and obtained by calcination subsequently. The morphology of the resultant fibres was investigated by scanning electron microscopy and transmission electron microscopy. The composition and crystal structure of the sample were investigated by X-ray photoelectron spectroscopy and X-ray diffraction. The good electrical conductivity of Ag-ZnO nanofibers was confirmed by cyclic voltammetry and electrochemical impedance spectroscopy. The resultant Ag-ZnO modified electrode presented excellent catalytic activity to the reduction of H₂O₂. The detection concentration range is from 1 × 10−5 to 4 × 10−3 M (R2 = 0.9992), with the minimum detection limit of 0.3 × 10−6 M (S/N > 3). Ag-ZnO nanocomposite fibers have high selectivity, high sensitivity and good stability in the non-enzyme hydrogen peroxide sensing.