Integrative Chemistry Toward Designing Polyvinyl Alcohol/Poly-aniline/Vanadium Oxide Nanocomposite-based Macroscopic Fib
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Integrative Chemistry Toward Designing Polyvinyl Alcohol/Poly-aniline/Vanadium Oxide Nanocomposite-based Macroscopic Fibers: 1D-Highly Sensitive Alcohol Sensors Bearing Enhanced Toughness Nicolas Brun1, 2, Julien Dexmer1, Céline M. Leroy1, Hélène Sérier1, Nathalie Steunou3, MarieFrance Achard1, Rénal Backov1 1
Centre de Recherche Paul Pascal UPR 8641 CNRS, PESSAC, France. Institut des Sciences Moléculaires UMR 5255 CNRS Université Bordeaux 1, TALENCE, France. 3 Laboratoire de Chimie de la Matière Condensée de Paris UMR 7574 CNRS Université Pierre et Marie Curie, PARIS, France. 2
ABSTRACT Polyvinyl alcohol/Poly-aniline/Vanadium Oxide nanocomposite-based macroscopic fibers have been generated by using a redox reaction addressed while performing an extrusion shaping process. The resulting composites have been thoroughly characterized via a large set of techniques such as SEM, SAXS, XRD and FTIR, in order to determine aniline effects over final materials’ structures and properties. Thus, the perturbation of the preferential orientation of the V2O5 nano-ribbons toward the fiber main axis, induced by aniline Red-ox intercalation, has been observed. Also, the partial reduction of V5+ species to V4+ ones, due to the strongly oxidizing character of the first ones toward aniline, has been revealed by Electron Spin Resonance (ESR). Moreover, these fibers are able to detect 5 ppm of ethanol within 3-5 seconds at 42 °C, and possess a toughness of 12 J.g-1. INTRODUCTION Hierarchical architectures offering enhanced functionality are of crucial importance for the society emerging demands and needs. To reach such highly functional architectures with an idea of “rational design” it seems important to combine several domains of research, i.e. soft chemistry, biology, physical chemistry of complex fluids, and so forth. In this general context, the new transversal concept of “integrative chemistry” has been postulated recently offering thus a versatile tool box where the communities mentioned above will find specific items to compose their own synthetic pathway to reach specific functionalities occurring at diverse length scales [1]. In this context, first vanadium oxide macroscopic fibers have been obtained through combining sol-gel chemistry and extrusion process [2]. More recently, composite macroscopic fibers made of vanadium oxide/Polyvinyl alcohol (PVA)/Latex nanoparticles have been generated using an extrusion process, and an induced porosity has been reached upon latex removal by performing a thermal treatment. Thus, inorganic vanadium oxide fibers enable to detect 0.1 ppm of ethanol within 3 to 5 seconds at 42 °C have been obtained, sensing performance that is certainly one of the highest sensibility never reach to date. Nevertheless, we found out that all the parameters involved within the as-synthesized fibers mechanical and sensing properties are acting within a partitive action mode rather than a cooperative one [3].
Considering this last study, we propose [4] to promote and enhance both the fiber sensing
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