A NADH Sensor Based on 1,2-Naphththoquinone Electropolymerized on Multi-walled Carbon Nanotubes Modified Glassy Carbon Electrode

作者：Liu Suqin^*; Dai Gaopeng; Yuan Ling; Zhao Yanping

来源：Journal of the Chinese Chemical Society, 2012, 59(11): 1409-1414.

DOI：10.1002/jccs.201200049

• Multi-wall carbon nanotubes
• 1,2-Naphthoquinone
• NADH
• Modified electrode
• Synergistic effect

A new carbon nanotubes modified electrode (poly-Nq-MWCNTs/GCE) was fabricated by electropolymerization of 1,2-naphththoquinone to the surface of multi-walled carbon nanotubes modified electrode by casting method. The morphology of the nanocomposite was characterized by scanning electron microscopy. Cyclic voltammetry and chronoamperometry were applied to investigate the electrochemical properties of the poly-Nq-MWCNTs nanocomposite modified electrode. The result of electrochemical experiments showed that such modified electrode had a favorable catalytic ability to oxidation of beta-nicotinamide adenine dinucleotide (NADH). The resulted sensor was sensitiveness to NADH and achieved 95% of the steady-state current within 5s. Furthermore, the anodic peak current was linear to the concentration of NADH for the range from 1.0 mu M to 0.14 mM. The linear equation was: I(mu A) = 0.3987 + 0.1035c (union), the correlation coefficient r = 0.9962, the detect limit is down to 1 x 10(-7) (S/N = 3) and the sensitivity is 0.1035 mu A/mu mol. The well catalytic activity of the sensor was ascribed to the synergistic effect role played by MWCNTs and poly-Nq. Moreover, the based sensor possesses good stability and reproducibility.

• 出版日期2012-11
• 单位湖北文理学院