化学修饰铂电极传感扑热息痛中的温度效应

Temperature effects on chemically modified Pt electrode sensing paracetamol

通过电化学方法制备了3类化学修饰电极:电化学氧化法将4-氨基苯甲酸(4-Amino-benzoic acid,4-ABA)共价修饰到铂电极上,形成单分子层膜修饰电极(4-ABA/Pt);恒电位沉积法将铂纳米粒子(Nanoparticles,NPs)修饰到铂电极上,形成NPs修饰电极(PtNPs/Pt);先恒电位,然后循环伏安将3-噻吩丙二酸(3-Thiophenemalonic acid,3-TMA)聚合到铂电极上,形成聚合物薄膜修饰电极(poly(3-TMA)/Pt)。线性伏安法测试3种修饰电极在不同温度下传感扑热息痛(Paracetamol,PCT),得出PCT在较宽浓度范围内都与其氧化峰电流呈良好的线性关系,但在不同温度条件下灵敏度是不同的。通过分析温度对PCT活度、离子导体和电子导体电阻的影响,对这一结果给出合理的解释。

Three kinds of chemically modified electrode（CME） are prepared with electrochemical method.With electrochemical oxidation,4-aminobenzoic acid（4-ABA） is covalently modified on Pt electrode to form the 4-ABA/Pt.With the potentiostatic method,the Pt nanoparticles（NPs） are electrodeposited on Pt electrode to form the PtNPs/Pt.With the potentiostatic process followed by cyclic voltammetry method,3-thiophenemalonic acid（3-TMA） is electropolymerized on Pt electrode to form the poly（3-TMA）/Pt.CMEs are applied to sense paracetamol（PCT） at different temperatures.The results show that the PCT concentration has a linear relationship with the oxidation peak current in a wide concentration range but the sensitivity is different at different temperature.The temperature effect on the PCT activity and resistance of ionic conductor and electronic conductor can be used to explain the result.