中文摘要：

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0．01mol／L硫酸溶液中，富集电位为-0．1V且富集时间为3min时，甲醛的氧化峰电流与其浓度在8．0umol／L-1．0mmol／L呈良好的线性关系（r=0．996），检测限为3．0umol／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．

英文摘要：

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.