In-situ monitoring of alkanethiol self-assembled monolayer chemisorption with combined spectroscopic ellipsometry and quartz crystal microbalance techniques |
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| Authors: | K.B. Rodenhausen B.A. DuensingT. Kasputis A.K. Pannier T. Hofmann M. Schubert T.E. TiwaldM. Solinsky M. Wagner |
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| Affiliation: | a Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, USAb Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, USAc Department of Biological Systems Engineering, University of Nebraska-Lincoln, USAd Biomedical Engineering Program, University of Nebraska-Lincoln, USAe Department of Electrical Engineering, University of Nebraska-Lincoln, USAf J.A. Woollam Co., Inc., 645 Main Street, Suite 102, Lincoln, NE 68508, USAg The Procter & Gamble Company, 11810 E. Miami River Rd., Cincinnati, OH 45252, USA |
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| Abstract: | Self-assembled monolayers (SAMs) formed via chemisorption are important for a variety of surface enhancement and biological applications. We demonstrate that combinatorial spectroscopic ellipsometry (SE) and quartz crystal microbalance with dissipation (QCM-D) provides dynamic, in-situ characterization of the chemisorption process. In agreement with other studies, we find there are two steps for 1-decanethiol, an example alkanethiol SAM, chemisorption onto gold, which are a brief, fast phase followed by one that is long but slower. By using both the optical (SE) and mechanical (QCM-D) techniques, we show that the SAM porosity decreases during the second phase as the coupled ethanol solvent in the disorganized layer is replaced by more alkanethiol. |
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| Keywords: | Spectroscopic ellipsometry Quartz crystal microbalance Self-assembled monolayers SAMs Alkanethiols |
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