BAM Bundesanstalt für Materialforschung und -prüfung, D-12203 Berlin, Germany.
Langmuir. 2010 Mar 16;26(6):3949-54. doi: 10.1021/la903293b.
Amino-terminated self-assembled monolayers on gold substrates were studied by X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS) measurements, and atomic force microscopy (AFM). Two different omega-amino-4,4'-terphenyl substituted alkanethiols of the general structure H(2)N-(C(6)H(4))(3)-(CH(2))(n)-SH (ATPn) were used: 2-(4''-amino-1,1':4',1''-terphenyl-4-yl)ethane-1-thiol (n = 2, ATP2) and 3-(4''-amino-1,1':4',1''-terphenyl-4-yl)propane-1-thiol (n = 3, ATP3). Moreover, the addressability of amino groups within the films was investigated by chemical derivatization of ATPn SAMs with 3,5-bis(trifluoromethyl)phenyl isothiocyanate (ITC) forming fluorinated thiourea ATPn-F films. Evaluation of high-resolution C 1s and N 1s XPS data revealed successful derivatization of at least 50% of surface amino species. Furthermore, it could be demonstrated by angle-resolved NEXAFS spectroscopy that chemical derivatization with ITC has no noticeable influence on the preferential upright orientation of the molecules in the SAMs.
采用 X 射线光电子能谱（XPS）、近边 X 射线吸收精细结构（NEXAFS）测量和原子力显微镜（AFM）研究了金基底上的氨基末端自组装单分子层。使用了两种不同的 ω-氨基-4,4'-三联苯取代的烷硫醇的一般结构 H(2)N-(C(6)H(4))(3)-(CH(2))(n)-SH（ATPn）：2-(4''-氨基-1,1':4',1''-三联苯-4-基)乙烷-1-硫醇（n = 2，ATP2）和 3-(4''-氨基-1,1':4',1''-三联苯-4-基)丙烷-1-硫醇（n = 3，ATP3）。此外，通过用 3,5-双（三氟甲基）苯基异硫氰酸酯（ITC）对 ATPn SAM 进行化学衍生化，研究了薄膜中氨基的可寻址性，形成氟化硫脲 ATPn-F 薄膜。高分辨率 C 1s 和 N 1s XPS 数据的评估表明，表面氨基物种的至少 50%成功衍生化。此外，通过角分辨 NEXAFS 光谱可以证明，用 ITC 进行化学衍生化对 SAM 中分子的优先垂直取向没有明显影响。
