对交流电场下双巯基烷烃硫醇自组装分子膜的阻抗谱进行了研究.利用汞金属作为衬底,制备出双巯基烷烃硫醇自组装分子膜,并通过交流频谱仪对其进行频谱的扫描．明确了膜的作用范围为阻抗谱中频部分为了解释该阻抗谱,提出了一种串联的等效电路来进行了拟合,并与其他的模型进行比较.同时,观察到在损耗谱中损耗峰随硫醇碳链原子数的增加而向低频方向移动并得出双巯基硫醇(C6-C10)在交流电场下的激活能为23～39 meV． The impedance spectra of the bimolyalcaptane-thiol self-assembled molecular films under AC electric field were studied.Metalcaprolalkanethiol self-assembled molecular films were prepared by using mercury metal as the substrate, and the spectra were scanned by AC spectrum analyzer . In order to explain the impedance spectrum, a series of equivalent circuits were proposed to be fitted and compared with other models.At the same time, loss peaks were observed in the loss spectrum With the increase of the number of carbon atoms in mercaptan, the activation energy of bis-mercaptothiol (C6-C10) under alternating current was 23-39 meV.