纳米金/碳纳米管修饰石墨电极测定邻苯二酚

采用自沉积方法将HAuCl4直接还原成纳米金颗粒并修饰在碳纳米管表面,所制备的纳米金(Au-CNTs/C)修饰电极对邻苯二酚(CAT)具有高的电催化氧化作用.采用循环伏安法考察CAT在Au-CNTs/C电极上的电化学行为,发现CAT在该修饰电极上发生可逆的氧化还原反应,在0.25V有明显的氧化峰.在磷酸盐缓冲溶液PBS(pH7.4)中,CAT的响应电流与浓度在5.0×10-7~5.0×10-3mol/L范围内呈线性关系,相关系数为0.9992,检出限为3.3×10-7mol/L.

Electrochermical determinnation of catechol with nano-gold/carbon nanotubes modified graphite electrode

Surface of carbon nanotubes (CNTs) supported gold (Au) nanoparticles was prepared by spontaneous reduction of HAuCl4 aqueous solution, and as-prepared Au-CNTs/C electrodes show high electrocatalytic performance for CAT. The electrochemical behaviors of Au-CNTs/C elecrodes were investigatated by cyclic votammetry. It was obtained a well-shaped redox reactin at Au-CNTs/C elecrodes, and oxidation peak of catechol was obviously observed at 0.25V. Additional, linear relationship was obtained between Ipa and concentration of catechol in the range of 5.0′10-7~ 5.0′10-3mol/L in phosphate buffer solution (pH 7.4), with a correlation coefficient of 0.9992, and the detection limit of this method was found to be 3.3′10-7mol/L.