N-烷基-2-巯基乙酰胺自组装膜阻隔溶液离子跨膜输运能力

Protective characteristics of self-assembly monolayers of N-alkyl-2-mercapto-acetamide in obstructing ions in solutions from transferring through the film

采用自组装手段 ,将 3种不同链长的N 烷基 2 巯基乙酰胺分子 (HSCH2 CONH(CH2 ) nCH3 ,n =6,1 1 ,1 7)组装于多晶金 (Au)表面 ,形成自组装单分子膜 (SAMs) .接触角测量值表明 ,SAMs具有与长链硫醇形成的自组装单分子膜相近的润湿性和致密性 .循环伏安和阻抗测量表明 ,SAMs的缺陷随分子链长的增加而降低 ,界面电荷传输阻力亦随分子链长的增加而增加 ,界面氧化还原反应随着链长的增加逐渐转化为完全的动力学控制过程 .SAMs有效阻隔了溶液离子。

Three different chain length ω substituted alkanethiols with organic structures containing acetamide groups: HSCH 2CONH(CH 2) 6CH 3, HSCH 2CONH(CH 2) 11 CH 3 and HSCH 2CONH(CH 2) 17 CH 3 are assembled on polycrystalline gold to form self assembly monolayers (SAMs) by the molecular self assembly (SA). Contact angle measurement (CAM) suggests that the SAMs are highly uniform. Cyclic voltammetry (CV) and A.C. impedance (IMP) measurements indicate that SAMs with longer chain length have larger coverage area and can protect solution ion from transferring across the thin film.