以硼氢化钠为还原剂,采用原位生长法将铜纳米粒子(CuNPs)和氧化石墨烯(GO)键合在聚丙烯酸(PAA)上,形成一种对苯二酚异构体催化活性高的纳米铜复合材料(CuNPs/PAA/rGO).用扫描电镜/能谱(SEM/EDS)和电化学阻抗表征了材料的形貌、组成和电化学性能.结果表明,该修饰电极的有效面积是裸电极的13.91倍,不同扫速条件下,以其修饰玻碳电极构建的电化学体系受扩散控制.采用微分脉冲伏安法检测苯二酚异构体时发现,当苯二酚(HQ)和邻苯二酚(CC)两种异构体共存且同时变化时,其氧化峰电流与浓度在0.2～36μmol·L-1范围内呈良好的线性关系,线性方程分别为IHQ (μA)=-1.86C-13.19(R2=0.998 7),检测限为1.6 pmol·L-1(S/N=3);Icc(μA)=-1.52C-8.29(R2=0.9989),检测限为31.5 pmol·L-1(S/N=3).该传感器具有经济易制备、灵敏性高、稳定性好、重现性好、抗干扰能力强、准确度高等优点.%In this paper,with sodium borohydride as reducing agent,a moderate and simple in-situ growth approach is used to load copper nanoparticles(CuNPs) and the grapheme(GO) on the polyacrylic acid(PAA) for preparing CuNPs/PAA/rGO nanocomposites,which exhibits a high catalytic activity to dihydroxybenzene isomers.The morphology and element composition of nanocomposites are observed by scanning electron microscopy(SEM) and X-ray energy dispersive spectroscopy(EDS).The modification of the electrode is characterized by electrochemical impedance spectroscopy(EIS).The effective area of 98.22 mm2 for the CuNPs/PAA/rGO/GCE is 13.91 times compared with the bare electrode.Various scan rates indicate that the electrochemical system is controlled by diffusion.According to differential pulse voltammetry,the peak currents of dihydroxybenzene isomers are linear to their concentrations at the range of0.2～36 μmol,L-1 The linear equation is IHQ(μA)=-1.86C-13.19(R2=0.998 7),Icc(μA)=-1.52C-8.29(R2 =0.998 9) and its detection limits are 1.6 pmol· L-1 and 31.5 pmol· L-1 (S/N=3),respectively.The sensor displays the advantages such as facile fabrication approach,high sensitivity,good stability,high reproducibility,good anti-interference ability and high accuracy.
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