【摘要】 <正>化学电阻传感器以其低能耗、低价格和便携性而备受关注,其基本装置是在一对平行电极间沉积一种材料薄膜,构成一个直流电路,于固定偏压下施加一线性变化的电压,记录I-V曲线.由于分析物使材料薄膜膨胀,引起该沉积材料的电阻即I-V曲线的斜率发生变化,从而将分析物与该沉积材料反应前后的电阻比作为分析信号.该传感器的实验装置操作简单,但灵敏度低且基线漂移较大,通常只能用于气相或纯有机相中分析物的测定.目前,为解决该传感器不能用于水介质中分析测定的问更多还原

【Abstract】 A novel electrochemically interfacial potential sensor was developed.The setup of the sensor was to connect a conducting material between two clips of working and count electrodes of a three-electrode potentiostat to be Ohmic circuit.Experimental procedure included immersing the conducting material in aqueous solution containing some species of interest,applying a linear sweep potential(with respect of reference electrode) to the conducting material and recording the I-E curve.Owing to the distribution,adsorption,reaction and others of the species at the conducting material-solution interface,interfacial potential changed and offseted applied potential partially,resulted in the shift of the recorded I-E curve along potential axis.The shift of the I-E curve was marked with so-called zero current potential where circuit current is zero in the I-E curve.With the dependence of zero current potential on interfacial potential in various interfacial conditions,the sensor has wide application field not only in the study of interfacial phenomena but also in the analytical determination.更多还原