摘要
采用电容测试法研究了N80油套管钢在浓度为0.5 mol/L NaHCO3溶液中形成钝化膜的半导体性能,结合Mott-Schottky方程分析了测试频率,成膜电位和C l-浓度对钝化膜半导体性能的影响。电容测试结果表明,钝化膜呈n型半导体特性,Mott-Schottky曲线的斜率随着测试频率的增加、成膜电位的正移和溶液中氯离子浓度的增加而增加,相应地膜内的施主密度减小。光电化学实验结果表明,光电流强度随成膜电位的正移及成膜时间的延长而增加,这主要归功于高电位和长时间下所成的钝化膜具有比较均匀的组成,光激发所成的空位或电子在膜内的迁移率的增加。
The semi-conductive properties of the passive film formed on N80 tube steel in 0.5 mol/L NaHCO3 solution were investigated via capacitance measurement. Based on Mott-Schottky equation, the factors, such as measuring frequency, formation potential and Cl^- concentration, which affect the semi-conductive performance of the passive films, were analyzed. The results show that the passive film exhibited n-type semi-conductive character. The donor density of the passive film decreased with the increase of the measurement frequency, the formation potential, and Cl^- concentration. The photo-electrochemical experiments revealed that the photo-current increased with the increase of the formation potential and the formation time, which was attributed to the increasing mobility of the photo-generated holes or electrons.
出处
《应用化学》
CAS
CSCD
北大核心
2007年第6期688-692,共5页
Chinese Journal of Applied Chemistry
关键词
N80油套管钢
电容测试法
光电流法
钝化膜
半导体特性
capacitance measurement, photocurrent measurement, passive film, semi-conductive property
