Electrochemiluminescence of CdSe Quantum Dots Composited with Nitrogen‐Doped Carbon Nanotubes |
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| Authors: | Liang Guo Xuan Liu Zheng Hu Shengyuan Deng Huangxian Ju |
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| Institution: | 1. Key Laboratory of Analytical Chemistry for Life Science (Ministry of Education of China), Department of Chemistry, Nanjing University, Nanjing 210093, P.?R. China;2. Key Laboratory of Mesoscopic Chemistry (Ministry of Education of China), Department of Chemistry, Nanjing University, Nanjing 210093, P.?R. China |
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| Abstract: | A nanocomposite of CdSe quantum dots with nitrogen‐doped carbon nanotubes was prepared for enhancing the electrochemiluminescent (ECL) emission of quantum dots. With hydrogen peroxide as co‐reactant, the nanocomposite modified electrode showed a cathodic ECL emission with a starting potential of ?0.97 V (vs. Ag/AgCl) in phosphate buffer solution, which was five‐times stronger than that from pure CdSe quantum dots and three‐times stronger than that from CdSe quantum dots composited with carbon nanotubes. The latter showed a starting potential of ?1.19 V. This result led to a sensitive ECL sensing of hydrogen peroxide with good stability, acceptable reproducibility and a detection limit down to 2.1×10?7 mol L?1. Nitrogen‐doped carbon nanotubes could be used as a good material for the construction of sensitive ECL biosensors for chemical and biochemical analysis. |
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| Keywords: | Electrochemiluminescence Quantum dots Sensors Nitrogen‐doped carbon nanotubes Hydrogen peroxide |
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