期刊
ACS NANO
卷 4, 期 7, 页码 4292-4298出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn1010057
关键词
nitrogen-doped carbon nanotubes; electrocatalytic; oxygen reduction; hydrogen peroxide; glucose; choline
类别
资金
- National Basic Research Program of China [2010CB732400]
- National Natural Science Foundation of China [20675013, 208750131]
- Technology Support Programme of Jiangsu Province [SBE200900289]
- Specialized Research Funds for the Doctoral Program of Higher Education [200802860035]
This study compares the electrocatalytic activity of nitrogen-doped carbon nanotubes (NCNTs) with multiwalled carbon nanotubes (MWCNTs). Results indicate that NCNTs possess a marked electrocatalytic activity toward oxygen reduction reaction (ORR) by an efficient four-electron process in the alkaline condition, while the process of MWCNTs is through a two-electron pathway. Meanwhile, NCNTs show a very attractive electrochemical performance for the redox reaction of hydrogen peroxide (H2O2) and could be employed as a H2O2 sensor at a low potential of +0.3 V. The sensitivity of the NCNT-based biosensor reaches 24.5 mu A/mM, more than 87 times that of the MWCNT-based one. Moreover, NCNTs exhibit striking analytical stability and reproducibility, which enables a reliable and sensitive determination of glucose by monitoring H2O2 produced by an enzymatic reaction between glucose oxidase/glucose or choline oxidase/choline at +0.3 V without the help of the electron mediator. The NCNT-based glucose biosensor has a linear range from 2 to 140 mu M with an extremely high sensitivity of 14.9 mu A/mM, and the detection limit is estimated to be 1.2 mu M at a signal-to-noise ratio of 3. The results indicate that the NCNTs are good nanostructured materials for potential application in biosensors.
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