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    In-situ monitoring of alkanethiol self-assembled monolayer chemisorption with combined spectroscopic ellipsometry and quartz crystal microbalance techniques

    Year: 2011

    Journal: Thin Solid Films, Volume 519, Issue 9, 28 February 2011, Pages 2817-2820, 20110525

    Authors: Rodenhausen K.B. 1 2, Duensing B.A. 3., Kasputis T. 3 4, Pannier A.K. 2 3, Hofmann T. 4 5, Schubert M. 2 5, Tiwald T.E. 6, Solinsky M. 7, Wagner M. 7

    Last authors: M. Wagner

    Organizations: 1 Department of Chemical and Biomolecular Engineering, University of Nebraska-Lincoln, USA 2 Nebraska Center for Materials and Nanoscience, University of Nebraska-Lincoln, USA 3 Department of Biological Systems Engineering, University of Nebraska-Lincoln, USA 4 Biomedical Engineering Program, University of Nebraska-Lincoln, USA 5 Department of Electrical Engineering, University of Nebraska-Lincoln, USA 6 J.A. Woollam Co., Inc., 645 Main Street, Suite 102, Lincoln, NE 68508, USA 7 The Procter & Gamble Company, 11810 E. Miami River Rd., Cincinnati, OH 45252, USA

    Country: USA, US, United States, United States of America, America

    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.