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[Wiley数据库][2012]Electrodeposited Graphene and Silver Nanoparticles Modified Electrode for Direct Ele
发布时间:2016-03-15 22:06:42 阅读次数:
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题名
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[Wiley数据库][2012]Electrodeposited Graphene and Silver Nanoparticles Modified Electrode for Direct electrochemistry and Electrocatalysis of Hemoglobin
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参考引用方式
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Wei Sun, Yuanyuan Zhang, Xiuzhen Wang, Xiaomei Ju, Dan Wang, Jie Wu, Zhenfan Sun. Electroanalysis 2012, 24, No. 10, 1973–1979
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研究机构
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海南师范大学；青岛科技大学
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所涉及离子液体
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研究领域
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论文摘要
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By using a 1-butylpyridinium hexafluorophosphate based carbon ionic liquid electrode (CILE) as the working electrode, graphene (GR) nanosheets and silver nanoparticles (Ag NPs) were step by step electrodeposited on the surface of the CILE with potentiostatic method. The fabricated Ag/GR/CILE was used as a new platform for protein electrochemistry and hemoglobin (Hb) was immobilized on its surface with chitosan (CTS) as film forming material. In 0.1 mol/L phosphate buffer solution, a pair of well-defined and quasi-reversible redox peaks appeared on the CTS/Hb/Ag/GR/CILE with a formal peak potential of -0.202 V (vs. SCE) and a peak-to-peak separation (ΔEp) of 68 mV, which indicated that direct electrochemistry of Hb was realized on the modified electrode. The results could be attributed to the synergistic effects of Ag NPs and GR nanosheets on the electrode surface, which provided a specific three-dimensional structure with high conductivity and good biocompatibility. The Hb modified electrode showed excellent electrocatalysis to the reduction of trichloroacetic acid in the concentration range from 0.8 to 22.0 mmol/L with a detection limit of 0.42 mmol/L (3σ). Moreover, the modified electrode exhibited favorable reproducibility, long term stability and accuracy, with potential applications in the third-generation electrochemical biosensor.
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关键词
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Hemoglobin, Silver nanoparticles, Graphene, Carbon ionic liquid electrodes, Direct electrochemistry
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