期刊
ANALYTICAL METHODS
卷 3, 期 7, 页码 1601-1606出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1ay05126a
关键词
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资金
- National Natural Science Foundation of China [20775039, 21005043]
- Natural Science Foundation of Shandong Province of China [ZR2009BM031, Q2008B05]
- Shandong Company, China National Tobacco Corporation [KN172]
- Scientific Special Expenditure for Non-profit Public Industry of State Oceanic Administration [201105020]
- Scientific Research Fund of the First Institute of Oceanography, SOA [2010T04]
A novel sensing platform based on gold nanoparticles/polyaniline/polydopamine (AuNPs/PANI/pDA) hybrid composite was proposed. The AuNPs/PANI/pDA hybrid composite was facilely synthesized by a two-step reaction, including the spontaneous self-polymerization of dopamine and the formation of AuNPs with both pDA and aniline as the reducing agent in the presence of poly(vinyl pyrrolidone) (PVP). As AuNPs associated with PVP provided negative charges for anionic doping, the resulting AuNPs/PANI/pDA composite exhibited good electroactivity in neutral solution. Meanwhile, AuNPs permitted a facile flow of electrons cross the PANI matrix during the electrochemical process and endowed the hybrid composite with enhanced catalytic ability. To investigate the electrocatalytic capability, the AuNPs/PANI/pDA hybrid composite modified electrode was used to electrocatalyze the oxidation of ascorbic acid (AA). Under optimized conditions, the sensor showed a fast amperometric response (4 s), a good linear response toward AA over a wide range from 1.0 x 10(-6) to 1.9 x 10(-3) M, and a low detection limit of 4.0 x 10(-7) M. The current established sensing platform based on AuNPs/PANI/pDA hybrid composite should hold huge potential for loading enzymes, proteins, DNA, etc.
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