High-density gold nanoparticles on multi-walled carbon nanotube films: a sensitive electrochemical nonenzymatic platform of glucose

被引:14
|
作者
Zhou, Li [1 ,2 ]
Gan, Tian [1 ]
Zheng, Dongyun [1 ]
Yan, Jiujuan [1 ]
Hu, Chengguo [1 ]
Hu, Shengshui [1 ,2 ]
机构
[1] Wuhan Univ, Minist Educ, Coll Chem & Mol Sci, Key Lab Analyt Chem Biol & Med, Wuhan 430072, Hubei, Peoples R China
[2] Chinese Acad Sci, State Key Lab Transducer Technol, Beijing 100080, Peoples R China
关键词
carbon nanotubes; gold nanoparticles; Congo red; glucose; electrochemical sensors; CYTOCHROME-C; COMPOSITE COATINGS; AQUEOUS-SOLUTION; AU ELECTRODE; OXIDATION; BEHAVIOR; ELECTROOXIDATION; NANOCRYSTALS; ADSORPTION; REDUCTION;
D O I
10.1080/17458080.2010.515253
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this study, a simple electrochemical method for grafting high-density gold nanoparticles (GNPs) on Congo red functionalised multi-walled carbon nanotube (MWNT-CR) films was reported. The GNP-decorated MWNT-CR composite (GNP-MWNT-CR), prepared by the constant potential deposition of GNPs on MWNT-CR films, had a compact and uniform nanostructure with a large surface area. Electrochemical characterisations showed that the GNP-MWNT-CR film exhibited excellent catalytic activity towards the direct electrochemical oxidation of glucose in basic media, with a much higher sensitivity than MWNT films, GNP films and GNP-coated MWNT films (GNP-MWNT). Under optimal working conditions, the oxidation current of glucose at the GNP-MWNT-CR film increased linearly with its concentration in the range 5.0 mu M-37.0 mM with a low detection limit of 0.5 mu M (S/N = 3). This glucose electrochemical sensor was applied to the determination of glucose in human serum samples and the results were satisfied.
引用
收藏
页码:263 / 273
页数:11
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