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An anchoring strategy for photoswitchable biosensor technology: azobenzene-modified SAMs on Si(111) |
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| Authors: | P. Dietrich F. Michalik R. Schmidt C. Gahl G. Mao M. Breusing M. B. Raschke B. Priewisch T. Elsässer R. Mendelsohn M. Weinelt K. Rück-Braun |
| Affiliation: | 1. Institut für Chemie, Technische Universit?t Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany 2. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie im Forschungsverbund Berlin e.V., Max-Born-Strasse 2 A, 12489, Berlin, Germany 3. Department of Chemistry, Newark College, Rutgers University, 73 Warren St., Newark, NJ, 07102-1811, USA 4. Department of Chemistry, University of Washington, Box 351700, Seattle, WA, 98195-1700, USA |
| Abstract: | A mild and efficient procedure has been developed to obtain covalently attached self-assembled monolayers (SAMs) on Si(111) with photochromic azobenzene head-groups. Starting from neat or diluted carboxylic acid functionalized monolayers on-chip coupling reactions were applied to attach hydroxyl-functionalized azobenzene units to the SAMs by ester bond formation. The modified surfaces were characterized by high-resolution X-ray photoelectron spectroscopy (XPS), transmission Fourier transform infrared spectroscopy (FT-IR), and contact angle measurements. Reversible cis ↔ trans isomerizations of photoswitchable SAMs were monitored by wettability measurements. Electronic Supplementary Material The online version of this article () contains supplementary material, which is available to authorized users. Dedicated with respect and compliments to Professor Helmut Schwarz on the occasion of his 65th birthday. |
| Keywords: | PACS 79.60.Dp 78.30.-j 81.16.-c |
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