聚硫堇半导体性质的电化学证据  

Electrochemical Evidence of Semiconductor Properties of Polythionine

作　　者：孔泳[1] 穆绍林[1] 

机构地区：[1]扬州大学理学院化学系,扬州225002

出　　处：《物理化学学报》2001年第9期806-810,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金资助项目(20074027)

摘　　要：聚硫堇的电导率为9.6×10－6 S·cm－1,属有机半导体.在10 ℃至60 ℃温度范围内，测定了聚硫堇的循环伏安图、恒电位下的放电曲线和交流阻抗图,并测定了电解质溶液的电导率随温度的变化.在聚硫堇的循环伏安图上有一阳极峰和一阴极峰,它们的峰电流均随温度的升高而增加；恒电位下的放电电流也随温度升高而增加；而交流阻抗的结果表明,聚硫堇的电荷传递电阻Rct随温度升高而下降,即它的交换电流i0随温度升高而增加;而溶液电阻和膜电阻也随温度的升高而下降，这同样会引起电流随温度升高而增加.所以温度对固体半导体聚硫堇的电极反应速率的影响包含了电极反应的本身和电极的电导率等因素的影响.聚硫堇的扫描电镜图证实了它的表面是一种纤维状结构.The conductivity of polythionine is 9.6 x 10(-6) S.cm(-1), which is an organic semiconductor. The cyclic voltammograms, discharging curves at a constant potential, ac impedance plots of polythionine and the conductivity of the electrolyte solution were investigated. There are an anodic peak and a cathodic peak in the cyclic voltammogram of polythionine. Their peak currents increase with increasing temperature. The discharging current at constant potential also increases with increasing temperature. The result from ac impedance plots shows that the charge transfer resistance Rc, decreases with increasing temperature, i. e., its exchange current io increases with increasing temperature. The resistances of the solution and the film decrease with increasing temperature. These also cause the increase in the current with increasing temperature. Thus, the effect of temperature on the reaction rate of polythionine semiconductor contains several factors of the electrode reaction itself and the conductivity of polythionine etc.. The scanning electronic micrograph shows that the surface of polythionine is a fibrillar-like morphology.

关 键 词：聚硫堇 半导体性质 温度 反应速率 交流阻抗 表面形貌 有机高分子半导体 

分 类 号：O649[理学—物理化学]