硅基上端基为羧基自组装膜的制备及应用  

Formation and application of the carboxy-terminated self-assembled monolayers on silicon wafer

作　　者：毛强强[1] 熊芳馨[1] 赵静[1] 刘善堂[1] 

机构地区：[1]武汉工程大学化工与制药学院绿色化工过程省部共建教育部重点实验室,湖北武汉430074

出　　处：《武汉工程大学学报》2011年第8期10-13,24,共5页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金(20873097;21071113);武汉市学科带头人计划(200951830551);湖北省教育厅科学技术研究重大项目(Z20091502)

摘　　要：通过液相硅烷化的方法,在硅基底上制备了端基为氰基的分子自组装膜,利用氰基水解的方法,通过改变水溶液中酸的浓度以及反应温度和反应时间,研究了氰基转化为羧基的过程.红外光谱表征结果显示:表面转化完成后,分子自组装膜在2 250 cm-1处和1 711 cm-1处羧酸中羰基吸收峰的出现,证明自组装膜的端氰基已大部分转化为羧基;同时,表面转化后硅基自组装膜表面对纯水的接触角(31.5°)较端基为氰基的自组装膜的接触角(58.1°)有所减少,说明羧基的生成使表面亲水性增加.利用Ag+和COO-之间的化学吸附和化学试剂的原位还原,在端基为羧基的自组装膜表面组装了银纳米粒子.研究结果表明,通过化学方法可以将硅基上端基为氰基的有序分子自组装膜转变为端基为羧基的有序分子自组装膜,并且该自组装膜可以用来作为制备金属纳米粒子的功能基底.Cyano-terminated self-assembled monolayers（SAMs） were prepared on silicon wafer by the chemisorption of 4-（triethoxysilyl）-butyronitrile,followed by hydrolysis of the terminal groups in hydrochloric acid solution,and then the cyano groups were converted into carboxylic acid groups.Here we investigated the effects of the concentration of H＋,the reaction temperature and time of solution on the change of the top groups cyano into carboxylic acid.The disappearance of the absorption band of the C≡N at 2 250 cm-1 and the appearance of the C=O at 1 715 cm-1 in FT-IR spectra region provide direct evidence for the conversion of cyano to carboxyl groups.After the cyano were converted into carboxyl,the surface of SAM became hydrophilic and the water contact angle fell from approxiately 60° to 30°.Based on the ability of the carboxyl groups of the monolayer to bind Ag＋,followed by the reduction of Ag＋ to Ag0 with NaBH4,silver nanoparticles were generated on the carboxy-terminated SAMs surface.AFM image show the size of the silver nanoparticles was around 9 nm.These results demonstrated that the carboxy-terminated SAMs were prepared on silver wafer and could be used as a template for the formation of metal nanoparticles.

关 键 词：硅基 自组装膜 羧基 金属纳米粒子 

分 类 号：TN304.12[电子电信—物理电子学]