期刊
ANALYST
卷 136, 期 4, 页码 781-786出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0an00379d
关键词
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资金
- National Natural Science Foundation of China [20875076, 20905061]
- Scientific Initializing Foundation of Northwest University [PR09036]
- Science Foundation of Northwest University [09NW02]
- Education Department of Shaanxi Province, China [2010JK877]
- NWU [08YYB06]
A novel H2O2 sensor based on enzymatically induced deposition of electroactive polyaniline (PANI) at a horseradish peroxide (HRP)/aligned single-wall carbon nanotubes (SWCNTs) modified Au electrode is fabricated, and its electrochemical behaviors are investigated. Electrochemical impedance spectroscopy of the sensor confirmed the formation of PANI on SWCNTs through the HRP catalytic reaction. Cyclic voltammograms of PANI/HRP/SWCNTs modified Au electrodes showed a pair of well-defined redox peaks of PANI with reduction peak potentials of 0.211 and oxidation peak potentials of 0.293 V in 0.1 M HOAc-NaOAc (pH 4.3) solution. The oxidation peak current response of PANI is linearly related to H2O2 concentration from 2.5 mu M to 50.0 mu M with a correlation coefficient of 0.9923 and a sensitivity of 200 mu A mM(-1). The detection limit is determined to be 0.9 mu M with a signal-to-noise ratio of 3. Thus, the synergistic performance of the enzyme, the highly efficient polymerization of PANI, and the templated deposition of SWCNTs provided an extensive platform for the design of novel electrochemical biosensors.
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