石墨烯/银纳米颗粒复合材料的制备及其对双氧水的电化学检测

以氧化石墨烯(GO)和硝酸银为原材料,聚乙烯吡咯烷酮(PVP)为还原剂和稳定剂,通过水热法制备出还原氧化石墨烯/银纳米颗粒(rGO/AgNPs)复合材料。采用透射电子显微镜(TEM)、X射线衍射(XRD)及紫外-可见分光光度计(UV-Vis)对rGO/AgNPs复合材料的形貌、组成和结构进行表征。同时,将rGO/AgNPs复合材料修饰到玻碳电极表面制备出过氧化氢(H_2O_2)电化学传感器,通过循环伏安法(CV)和计时安培响应法(i-t)对传感器进行电化学性能测试。实验结果表明:制备的rGO/AgNPs传感器具有较好的电化学性能,其对H_2O_2检测的灵敏度为340.6μA·(mmol/L)~(-1)·cm~(-2),响应时间为3s,最低检测极限为7.5μmol/L(S/N=3),线性检测范围为20~4950μmol/L(线性相关系数为R=0.9973)。

Synthesis of rGO/AgNPs Composites with an Application to Electrochemically Detecting Hydrogen Peroxide

In this paper,reduced graphene oxide (rGO)and silver nanoparticles (AgNPs)composites were pre-pared through hydrothermal method utilizing graphene oxide (GO)and silver nitrate as raw materials,and using poly(N-vinyl-2-pyrrolidone)(PVP)as reductant and stabilizer.The morphology,composition and structure of rGO/AgNPs hybrids were characterized by transmission electron microscopy (TEM),X-ray diffraction (XRD)and ultravio-let-visible spectroscopy (UV-Vis).Meanwhile,a H2 O2 electrochemical sensor was developed by modifying rGO/Ag-NPs composites on the surface of glassy carbon electrode,and the electrochemical properties were investigated by cy-clic voltammetry and amperometry for H2 O2 detection.The measured results demonstrated that as-prepared rGO/Ag-NPs electrochemical sensor exhibited the sensitivity of 340.6μA·(mmol/L)-1 ·cm-2 ,a short response time of 3 s, a low detection limit of 7.5μmol/L (S/N=3)with a linear concentration response ranging from 20-4950μmol/L (R=0.9973).