基于石墨烯和金纳米棒复合物的过氧化氢电化学传感器

H_2O_2 Electrochemistry Biosensor Based on Graphene and Gold Nanorods Composites

利用阴离子型聚合物聚乙烯吡咯烷酮(PVP)保护的带负电荷的还原态石墨烯(GN)与带正电荷的金纳米棒(AuNR)之间的静电吸附,通过层层自组装的方法研制出一种新型过氧化氢(H2O2)传感器。首先将PVP保护的石墨烯(PVP-GNs)吸附到表面干净的裸玻碳电极(GCE)上,再将PVP-GNs修饰的电极浸泡于金纳米棒溶液中,通过静电吸附将金纳米棒负载在PVP-GNs膜之上。以循环伏安及计时安培电流等方法对修饰电极的性质进行了表征。结果表明,制备的PVP-GNs-AuNRs/GCE对H2O2的催化还原显示出好的电催化活性。测定H2O2的线性范围为25～712μmol/L;检出限(S/N=3)为7.5μmol/L。此传感器制作简单,具有响应快、稳定性好、灵敏度高等特点。

The facile synthesis of the novel graphene/gold nanorods （GNs-AuNRs） nanocomposites was reported. The PVP was used not only as the dispersant of graphene but also to immobilize positively charge AuNRs. The electrode modified with the PVP-GNs-AuNRs composite showed prominent electrocatalytic activity toward the reduction of H202, which could be explained by the remarkable synergistic effect of the AuNRs and GNs. Therefore, fast amperometric response of this sensor to H20= was observed with a linear range of 25-712 μ mol/L and a detection limit of 7.5μmol/L. The observed high stability, high sensi-tivity, and high reproducibility of the PVP-GNs-AuNRs films make them promising for the reliable and durable detec- tion Of H2O2.