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利用电化学还原的方法将还原氧化石墨烯(ERGO)和纳米金(AuNPs)电沉积到硫辛酰胺(T-NH2)修饰的金电极表面,研究了儿茶酚在该修饰电极上的电化学行为.实验表明,在0.10mol/L磷酸缓冲(pH=7.0)溶液中,该修饰电极对儿茶酚具有良好的电催化作用,儿茶酚氧化峰电位比未修饰的金电极负移了80 mV,氧化还原峰电流增大很多,响应电流与儿茶酚浓度在1.40×10-6~9.42×10-3 mol/L范围内呈良好的线性关系,检测的灵敏度为2 682.8μA·(mmol/L)/cm2,检测下限为7.00×10-7 mol/L.此电极具有较好的重现性和稳定性.对样品进行测定及加标回收实验,回收率在97.3%~103.0%之间.
Electrodeposition of reduced graphene oxide (ERGO) and gold nanoparticles (AuNPs) onto the surface of gold electrode modified with lipoamide (T-NH2) was investigated by electrochemical reduction. The electrochemical properties of catechol on the modified electrode The experiments show that the modified electrode has a good electrocatalytic activity on catechol in 0.10mol / L phosphate buffer solution (pH = 7.0), and the oxidation peak potential of catechol is negatively shifted by 80% compared with the unmodified gold electrode mV, the redox peak current increased a lot, the response current and catechol concentration in the range of 1.40 × 10-6 ~ 9.42 × 10-3 mol / L showed a good linear relationship, the detection sensitivity of 2 682.8μA · (mmol / L) / cm2, and the detection limit was 7.00 × 10-7 mol / L. The electrode has good reproducibility and stability.The recovery and recovery of the sample were 97.3% ~ 103.0% between.