基于铂/碳纳米管修饰电极的甲醛传感器

Formaldehyde Sensors Based on Chemically Modified Electrodes With Platinum Particles and Carbon Nanotubes

在碳纳米管(CNTs)修饰的玻碳电极(GCE)上采用电化学沉积法制备了铂微粒/碳纳米管修饰电极(Pt/ CNTs/GCE),并以该修饰电极作为甲醛的电化学传感器,用循环伏安法(CV)和线性扫描伏安法(LSV)研究了甲醛在该电极上的电化学行为,优化了实验条件,在此基础上建立了一种测定甲醛的伏安分析方法.实验表明:在0.01 mol/L硫酸溶液中,富集电位为-0.1 V且富集时间为3 min时,甲醛的氧化峰电流与其浓度在8.0μmol/L～1.0 mmol/L呈良好的线性关系(r=0.996),检测限为3.0μmol/L(信噪比为3:1).所提出的测定甲醛的方法具有较高的灵敏度和较好的重现性。

Platinum particles were electrochemically deposited on glassy carbon electrodes modified by carbon nanotubes. The chemically modified glassy carbon electrodes with platinum particles and carbon nanotubes （Pt/CNTs/GCE） were used as formaldehyde sensors. Electrochemical behaviors of formaldehyde at Pt/ CNTs/GCE were investigated by cyclic voltammetry （CV） and linear scan voltammetry （LSV）. Experimental conditions were optimized, and a voltammetric method for determining formaldehyde was developed. The experimental results show that the optimum accumulation potential is - 0.1 V and the optimum accumulation time is 180 s. A highly linear response to formaldehyde in the concentration range of 8.0umol/L- 1.0 mmol/L was observed in 0.01 mol/LH2SO4, with a detection limit of 3.0 umol/L estimated at a signal-to-noise ratio of 3： 1. The presented method of determining formaldehyde exhibits high sensitivity and good reproducibility.