碳纳米管修饰电极的制备及其对NADH的电催化氧化

采用丝网印刷技术,制备出羧基化多壁碳纳米管修饰的丝网印刷碳电极,并采用循环伏安法研究了该电极对还原型烟酰胺腺嘌呤二核苷酸(NADH)的电催化氧化性能.结果表明,与未修饰丝网印刷碳电极相比,多壁碳纳米管修饰丝网印刷碳电极显著降低了NADH的氧化峰电位,消除了反应产物对电极的污染及其它电化学反应对测量的干扰.将修饰电极与流...

Carbon nanotube-modified electrodes and the electro -catalytic oxidation of NADH

In this paper, the carboxylated multi-walled carbon nanotube-modified screen-printed carbon electrodes are prepared. Based on the cyclic voltammetry , the electro-catalytic oxidation of the modified electrodes on the nicotinamide adenine dinucleotide (NADH) is researched. The results show that multi-walled carbon nanotube -modified electrodes can make the oxidation peak potential of NADH reduced significantly compared with unmodified screen-printed carbon electrodes, avoid the reaction products to contaminate electrodes and make interference to other electrochemical reactions . Based on the modified electrodes and a flow-injection system , a method for measuring the concentration of NADH is put forward by using the current-time curve. In the range of 1mmol/L~6mmol/L, the response currents are keep linear relation with the concentrations of NADH with the regression equation of i(nA)= 1.5114c(mmol) + 0.11762, the correlation coefficient of 0.9915, and the detection limit of 0.7mmol / L.