Electrografting of aryl diazonium on thin layer platinum microbands: Towards customized surface functionalization within microsystems |
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| Affiliation: | 1. Chimie ParisTech, PSL Research University, Unité de Technologies Chimiques et Biologiques pour la Santé, 75005 Paris, France;2. INSERM, Unité de Technologies Chimiques et Biologiques pour la Santé (U 1022), 75006 Paris, France;3. CNRS, Unité de Technologies Chimiques et Biologiques pour la santé UMR 8258, 75006 Paris, France;4. Université Paris Descartes, Sorbonne Paris Cité, Unité de Technologies Chimiques et Biologiques pour la Santé, 75006 Paris, France;5. Ecole normale supérieure, PSL Research University, UPMC Univ Paris 06, CNRS, Département de Chimie, PASTEUR, 24, rue Lhomond, 75005 Paris, France;6. Sorbonne Universités, UPMC Univ Paris 06, ENS, CNRS, PASTEUR, 75005 Paris, France;1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;2. Department of Chemical and Materials Engineering, National Yunlin University of Science and Technology, Yunlin 64002, Taiwan;3. Institute of Micro/Nanotechnology, Old Dominion University, Norfolk, VA 23529, USA;4. Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan;5. Department of Mathematics, Tamkang University, Tamsui, Taipei 25137, Taiwan;1. TOSA Innovative Human Development Programs, Kochi University, 2-5-1 Akebono-cho, Kochi-shi, Kochi 780-8520, Japan;2. Department of Mathematics and Physics, Faculty of Science and Technology, Kochi University, 2-5-1 Akebono-cho, Kochi-shi, Kochi 780-8520, Japan |
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| Abstract: | The formation of organic thin layers on platinum microbands prepared by photolithography and sputtering techniques following the electrografting of a 4-azidobenzene diazonium salt was evaluated. The electrografting process was characterized by cyclic voltammetry in the presence of reversible redox probes. Further modification of the azide-modified platinum surfaces was achieved by the covalent attachment of ethynylferrocene via the copper(I)-catalyzed azide-alkyne cycloaddition-“click” reaction (CuAAC). Optimization of the electrografting method was performed based on the active ferrocene surface coverage reaching a maximum of 2.5 × 10− 10 mol cm− 2 after ten voltammetric scans. In addition, the modified microbands exhibited a high stability with a recovery of over 75% of the initial ferrocene response after 3 weeks of bench storage. This data supports the possibility of rapid and straightforward functionalization of platinum microbands for a range of analytical applications prior to their integration into microdevices. |
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