一种新型一氧化氮电化学传感器

将一种自合成的水溶性聚对苯撑乙烯(PPV)衍生物电聚合到玻碳电极表面, 制得一种新型NO电化学传感器. 实验结果表明， 该传感器对NO具有灵敏的伏安响应, 相对裸玻碳电极两个氧化峰电位均负移达180 mV. 安培实验结果表明， NO的响应电流与其浓度在 1.8×10-7～1.0×10-4 mol/L范围内有良好的线性关系(r＝0.999 3), 检出限达到2.3×10-8 mol/L. 用旋转圆盘电极研究了NO在该传感器上的电化学行为, 并计算出NO在0.1 mol/L的磷酸盐生理缓冲溶液(PBS)中的扩散系数.

A Novel Electrochemical Sensor for the Determination of Nitric Oxide

A novel water-soluble poly(p-phenylenevinylene) derivative was electropolymerized at glass carbon electrode by cyclic voltammetric method or two-potential steps method to develop a sensitive nitric oxide(NO) sensor.  The experimental results show  that the sensor exhibits apparent current response to NO by cyclic voltammetry.  Two anodic peaks potential  significantly shifted negatively copared with bare GCE.  The oxidation current(measured by chronoamperometry) is linear with NO concentration ranging from 1.8×10-7 to 1.0×10-4 mol/L with a linear coefficient of 0.999 3.  The detection limit of NO is 2.3×10-8 mol/L(S/N=3).  The electrochemical behavior of NO on this sensor was also characterized by rotating disk electrode.  The results also indicate that the oxidation of NO proceeds in two steps.  Rotating disk experiments yield a diffusion coefficient of NO in 0.1 mol/L PBS at 20 ℃, that is DNO=2.92×10-5 cm2/s.  The value of DNO was validated by chronocoulometry.