A sensitive electrochemical sensor for lead based on gold nanoparticles/nitrogen-doped graphene composites functionalized with L-cysteine-modified electrode

作者：Cheng, Yan-mei; Fa, Huan-bao^*; Yin, Wei^*; Hou, Chang-jun; Huo, Dan-qun; Liu, Fang-mei; Zhang, Ya; Chen, Can

来源：Journal of Solid State Electrochemistry, 2016, 20(2): 327-335.

DOI：10.1007/s10008-015-3043-0

• Electrochemical sensor
• Lead
• Nitrogen-doped graphene
• Gold nanoparticles
• L-cysteine
• Modified electrode

Glassy carbon electrodes (GCEs) modified with L-cysteine (L-cys)/gold nanoparticles (AuNPs)/nitrogen-doped graphene (NG) composite were prepared to fabricate a novel electrochemical sensor for lead. AuNPs were uniformly dispersed into NG and L-cys was successfully decorated on AuNPs through the S-Au bond. The L-cys/AuNPs/NG exhibited a well-distributed nanostructure and high responsivity toward Pb(II). The results indicated that L-cys/AuNPs/NG/GCE exhibited the highest peak current, reflecting that the L-cys/AuNPs/NG composites showed the best response signal toward Pb2+. Under optimized conditions, a linear relationship between the current intensity and Pb2+ concentration was obtained in a range of 0.5-80 mu g L-1 with a detection limit of 0.056 mu g L-1 (S/N = 3). The analytical interference procedure and practical application were investigated using the prepared electrode, which exhibited an acceptable result.

• 出版日期2016-2
• 单位重庆大学