基于铂/碳纳米管修饰电极的甲醛传感器

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。

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

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 8.0μmol/L～1.0 mmol/L was observed in 0.01 mol/LH_2SO_4,with a detection limit of 3.0μmol/L estimated at a signal-to-noise ratio of 3:1.The presented method of determining formaldehyde exhibits high sensitivity and good reproducibility.