引用本文:
张修华, 王升富, 邹其超. 2-巯基乙醇自组装膜电极的制备及其电化学性质[J]. 应用化学,
2002, 19(7): 657-661.
Citation: ZHANG Xiu-HUA, WANG Sheng-Fu, ZOU Qi-Chao. Preparation and Electrochemical Properties of 2-Mmercaptoethanol Self-assembled Monolayer Modified Gold Electrode[J]. Chinese Journal of Applied Chemistry, 2002, 19(7): 657-661.
Citation: ZHANG Xiu-HUA, WANG Sheng-Fu, ZOU Qi-Chao. Preparation and Electrochemical Properties of 2-Mmercaptoethanol Self-assembled Monolayer Modified Gold Electrode[J]. Chinese Journal of Applied Chemistry, 2002, 19(7): 657-661.
2-巯基乙醇自组装膜电极的制备及其电化学性质
摘要:
在裸Au电极上制备了2-巯基乙醇自组装膜电极(ME/AuSAMs),研究了该电极催化米吐尔和对苯二酚氧化的电化学行为,发现该膜加速了电子传递速率,测得米吐尔和对苯二酚的扩散系数分别为D米2.1×10-5cm2/s、D对2.7×10-6cm2/s,初步探讨了电催化机理.采用水平衰减全反射-傅立叶变换红外光谱(ATR-FTIR)技术对ME/AuSAMs进行了表征,示差脉冲伏安法(DPV)同时测定米吐尔和对苯二酚,不产生干扰,其氧化峰电流与相应物质的浓度分别在1.0×10-7~1.0×10-4mol/L和6.0×10-6~6.0×10-4mol/L范围内呈良好的线性关系,相关系数分别为0.9992和0.9996,检测限分别为2.0×10-8和1.2×10-6mol/L.该电极用于黑白显影液中米吐尔和对苯二酚的同时测定,结果满意.
English
Preparation and Electrochemical Properties of 2-Mmercaptoethanol Self-assembled Monolayer Modified Gold Electrode
Abstract:
2-Mercaptoethanol self-assembled monolayer modified gold electrode(ME/Au SAMs) has been fabricated. The electrochemical behavior of metol (N-methyl p-aminophenol sulfate) and p-benzenediol at ME/Au SAMs have been studied. The modified electrode shows an excellent electrocatalytic activity for the oxidation of metol and p-benzenediol, and accelerates electron transfer rate. Diffusion coefficients for metol and p-benzenediol were 2.1×10-5cm2/s and 2.7×10-6cm2/s, respectively. The electrocatalysis mechanism has been studied. ATR-FTIR was used for the characterization of the ME/Au SAMs. The oxidation currents were linear in the range of 1.0×10-7~1.0×10-4mol/L for metol and 6.0×10-6~6.0×10-4mol/L for p-benzenediol, with the correlation coefficients of 0.999 2 and 0.999 6 by differential pulse voltammetry (DPV), and detection limit 2.0×10-8mol/L and 1.2×10-6mol/L for metol and p-benzenediol, respectively. The modified electrode can be used for the simultaneous determination of metol and p-benzenediol in photographic imaging agents. The method is simple, quick, sensitive and accurate.
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Key words:
- mercaptoethanol
- / self-assembled monolayer
- / differential pulse voltammetry
- / metol
- / p-benzenediol
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