Synthesis and Application of Conducting Polyaniline-Fe3O4 Nanohybrid by Click Chemistry Reaction

Abstract: A conducting polyaniline-Fe 3 O 4 nanohybrid was synthesized via click coupling of iron oxide nanoparticles and 2-ethynylaniline. Covalent functionalization of the azide-functionalized iron oxide nanoparticles and the 2-ethynylaniline wasconfirmed with Fourier transform infrared spectroscopy and x-ray photoelectron spectroscopy, and the coating of polyanilineon iron oxide nanoparticles was confirmed with field-emission scanning electron microscopy. The nanohybrid incorporatedinto a poly(vinyl alcohol) (PVA) matrix by solution casting showed excellent compatibility with the PVA. Consequently, themechanical properties and electrical conductivities of the resultant composite films were improved remarkably. This clickcoupling protocol offers the possibility of completely combining the extraordinary performance of nanohybrids with PVAproperties.Keywords: hybrid, click chemistry, polyaniline, electrical conductivity, mechanical properties 1. Introduction Conducting nanohybrids have potential applications foruse in sensors, actuators, batteries, light emitting diodes, andelectromagnetic interference shielding devices [1,2]. Amongthe conducting polymers, polyaniline (PANI) has received agreat deal of attention due to its good environmental stability,easy doping-dedoping by chemical means, and facile synthesis.It can be readily prepared in bulk by chemical oxidativepolymerization of aniline under controlled conditions.Compared with many other π-conjugated polymers, PANIshows sufficient stability for practical applications. Theproperties of these conducting polymers can be easilymanipulated by the incorporation of nanomaterials. It isbecause the nanoscale particles are more attractive due tointriguing properties arising from the nanosize and largesurface area [3-5]. The incorporation of nanoscale fillers can alter the physicaland electrical properties of conducting polymers. Variousmetallic and metal oxide nanosize particles have so far beeninserted into the shell of conducting polymers giving rise toa host of nanocomposites. Magnetic nanoparticles of Fe

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