Next Article in Journal
Material Structure and Mechanical Properties of Silicon Nitride and Silicon Oxynitride Thin Films Deposited by Plasma Enhanced Chemical Vapor Deposition
Previous Article in Journal / Special Issue
On the Contrasting Effect Exerted by a Thin Layer of CdS against the Passivation of Silver Electrodes Coated with Thiols
Article Menu

Export Article

Open AccessArticle
Surfaces 2018, 1(1), 43-58; https://doi.org/10.3390/surfaces1010005

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

1
Faculté des Sciences, Université Cheikh Anta Diop, BP 5005 Dakar-Fann, Sénégal
2
Laboratoire Géomatériaux et Environnement, Université Paris-Est, 5 Bd. Descartes, 77454 Marne-la-Vallée CEDEX 2, France
3
Université Paris Est, CNRS, ICMPE (UMR 7182), 2-8 rue Henri Dunant, 94320 Thiais, France
*
Authors to whom correspondence should be addressed.
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)
Full-Text   |   PDF [4546 KB, uploaded 9 August 2018]   |  

Abstract

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
Figures

Graphical abstract

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Surfaces EISSN 2571-9637 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top