Adlayers of Dimannoside Thiols on Gold: Surface Chemical Analysis

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• 作者：Paul M. Dietrich ; Tim Horlacher ; Pierre-Luc Girard-Lauriault ; Thomas Gross ; Andreas Lippitz ; Hyegeun Min ; Thomas Wirth ; Riccardo Castelli ; Peter H. Seeberger ; Wolfgang E. S. Unger
• 刊名：Langmuir
• 出版年：2011
• 出版时间：April 19, 2011
• 年：2011
• 卷：27
• 期：8
• 页码：4808-4815
• 全文大小：989K
• 年卷期：v.27,no.8(April 19, 2011)
• ISSN：1520-5827

文摘

Carbohydrate films on gold based on dimannoside thiols (DMT) were prepared, and a complementary surface chemical analysis was performed in detail by X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS), near-edge X-ray absorption fine structure (NEXAFS), FT-IR, and contact angle measurements in order to verify formation of 蠅-carbohydrate-functionalized alkylthiol films. XPS (C 1s, O 1s, and S 2p) reveals information on carbohydrate specific alkoxy (C鈭扥) and acetal moieties (O鈭扖鈭扥) as well as thiolate species attached to gold. Angle-resolved synchrotron XPS was used for chemical speciation at ultimate surface sensitivity. Angle-resolved XPS analysis suggests the presence of an excess top layer composed of unbound sulfur components combined with alkyl moieties. Further support for DMT attachment on Au is given by ToF-SIMS and FT-IR analysis. Carbon and oxygen K-edge NEXAFS spectra were interpreted by applying the building block model supported by comparison to data of 1-undecanethiol, poly(vinyl alcohol), and polyoxymethylene. No linear dichroism effect was observed in the angle-resolved C K-edge NEXAFS.