Journal
LANGMUIR
Volume 27, Issue 8, Pages 4808-4815Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la104038q
Keywords
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Funding
- BAM presidency through the BAM Innovationsoffensive
- Adolf-Martens Fellowship Program
- ETH Zurich
- Max-Planck Society
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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 omega-carbohydrate-functionalized alkylthiol films XPS (C 1s, O 1s, and S 2p) reveals information on carbohydrate specific alkoxy (C-O) and acetal moieties (O-C-O) 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.
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