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Open AccessArticle

Diazonium Salts: Versatile Molecular Glues for Sticking Conductive Polymers to Flexible Electrodes

Faculté des Sciences, Université Cheikh Anta Diop, BP 5005 Dakar-Fann, Sénégal
Laboratoire Géomatériaux et Environnement, Université Paris-Est, 5 Bd. Descartes, 77454 Marne-la-Vallée CEDEX 2, France
Université Paris Est, CNRS, ICMPE (UMR 7182), 2-8 rue Henri Dunant, 94320 Thiais, France
Authors to whom correspondence should be addressed.
Surfaces 2018, 1(1), 43-58;
Received: 20 June 2018 / Revised: 20 July 2018 / Accepted: 22 July 2018 / Published: 8 August 2018
(This article belongs to the Special Issue Electrochemical Surface Science: Basics and Applications)
Adhesion of polymers to surfaces is of the upmost importance in timely applications such as protective coatings, biomaterials, sensors, new power sources and soft electronics. In this context, this work examines the role of molecular interactions in the adhesion of polypyrrole thin films to flexible Indium Tin Oxide (ITO) electrodes grafted with aryl layers from various diazonium salts, namely 4-carboxybenzenediazonium (ITO-CO2H), 4-sulfonicbenzenediazonium (ITO-SO3H), 4-N,N-dimethylbenzenediazonium (ITO-N(CH3)2), 4-aminobenzenediazonium (ITO-NH2), 4-cyanobenzenediazonium (ITO-CN) and 4-N-phenylbenzenediazonium (ITO-NHPh). It was demonstrated that PPy thin layers were adherent to all aryl-modified surfaces, whereas adhesive failure was noted for bare ITO following simple solvent washing or sonication. Adhesion of polypyrrole was investigated in terms of hydrophilic/hydrophobic character of the underlying aryl layer as probed by contact angle measurements. It was found that sulfonic acid-doped polypyrrole (PPy-BSA) thin films were preferably deposited on the most hydrophobic surfaces. More importantly, the redox properties and electrochemical impedance of PPy were closely related to the hydrophobic character of the aryl layers. This work demonstrates that diazonium compounds are unique molecular glues for conductive polymers and permit to tune their interfacial properties. With robust, diazonium-based architectured interfaces, one can design high performance materials for e.g., sensors, printed soft electronics and flexible thermoelectrics. View Full-Text
Keywords: polypyrrole; diazonium salts; flexible ITO; adhesion; redox properties polypyrrole; diazonium salts; flexible ITO; adhesion; redox properties
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Lo, M.; Pires, R.; Diaw, K.; Gningue-Sall, D.; Oturan, M.A.; Aaron, J.-J.; Chehimi, M.M. Diazonium Salts: Versatile Molecular Glues for Sticking Conductive Polymers to Flexible Electrodes. Surfaces 2018, 1, 43-58.

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