(西安交通大学 金属材料强度国家重点实验室， 西安 710049)
摘 要: 利用微分电容法结合Mott-Schottky理论研究铅电极1.28 V (vs SCE)下硫酸溶液中所形成阳极腐蚀膜的半导体性质， 同时对测试频率、 成膜时间及成膜溶液pH值等影响膜半导体性能的因素也做了分析。 结果表明： 铅阳极膜具有n型半导体特性， 施主密度ND随测试频率的增加而减小， 随极化时间的延长而增加， 随溶液pH值的增加而减小。 溶液pH值的改变可以显著影响膜的平带电位EFB， 两者间呈线性关系， 拟和斜率为60.43。
关键字: 阳极膜; 微分电容法; 施主密度; 平带电位
formed on lead
（State Key Laboratory for Mechanical Behavior of Materials,
Xi'an Jiao Tong University, Xi'an 710049, China）
Abstract: The semi-conductive properties of the anodic film formed on lead electrode at 1.28 V (vs SCE) in sulfuric acid solution were investigated by differential capacitance measurement and Mott-Schottky analysis. In addition, the factors affecting the semi-conductive property of anodic film, such as measured frequency, formation time and pH value of the solution, were analyzed. The results show that the anodic film shows an n-type semi-conductive character, the donor density (ND) decreases with the measurement frequency increasing, increases with the polarization time prolonging and decreases with pH value increasing. The flat-band potential (φFB) is significantly influenced by the pH value of the solution, they have a linear relationship with a slope of 60.43.
Key words: anodic film; differential capacitance measurement; donor density; flat-band potential
