Synthesis and characterization of polyaniline/graphene composites

• Grant number: 15/10149-7
• Support type: Scholarships in Brazil - Scientific Initiation
• Effective date (Start): June 01, 2015
• Effective date (End): December 31, 2017
• Field of knowledge: Engineering - Electrical Engineering
• Principal Investigator: Eunezio Antonio de Souza
• Grantee: Caroline Brambilla de Aquino
• Home Institution: Centro de Pesquisas Avançadas em Grafeno, Nanomateriais e Nanotecnologia (MackGrafe). Universidade Presbiteriana Mackenzie (UPM). Instituto Presbiteriano Mackenzie. São Paulo, SP, Brazil
• Associated research grant: 12/50259-8 - Graphene: photonics and opto-electronics: UPM-NUS collaboration, AP.SPEC

Abstract

Among the various materials used as super capacitors (or supercapacitors redox pseudocapacitores), lightweight polymers such as polyaniline (PANI), the polipirroles (PPY) and polythiophene (PT) have been studied due to its high capacitance, although they have low stability during processes face and unloading. Among these the most promising polymer is polyaniline, due to its capacitive property, low cost and ease of synthesis. The graphene has high electrical conductivity, large surface area and good mechanical properties, and which can be obtained through relatively simple chemical processing of the graphite. For these reasons, have been synthesized composite film of polyaniline nanofibers and / graphene by several methods that are characterized by their capacitive, electrical and optical properties. Graphene films and transparent conductors have been manufactured and used as polyaniline electrodes of electrochromic devices, and electrochemical properties which showed spectro-electrochemical similar to those of the films with indium and tin oxide, but with far greater stability, much higher and lower optical contrast switching time. Another composite polyaniline / graphene shown that it can retain the photoluminescent properties of pure polyaniline nano fibers. Domingues et al synthesized conductive transparent films and nanocomposites graphene / polyaniline by interfacial polymerization.