RESEARCH AND FABRICATION OF CONDUCTING POLYANILINE NANOPARTICLES BY ELECTROCHEMICAL AND CHEMICAL METHODS

摘要

Conducting polyaniline (PANi) and their composite nanoparticles were synthesized by both electrochemical and chemical methods. In electrochemical method, PANi and its composite were electro-synthesized in acidic medium (sulphuric acid and oxalic acid) on iron by cyclic voltammetry technique. In chemical method, PANi and its composite were polymerised by a self-assembly method using ammonium peroxydisulfate as an oxydant under supersonic stirring in aqueous medium. The obtained PANi product was characterised by Infra-Red and Raman spectroscopies. The nanostructure of PANi was examined by using Scanning and Transmission Electron Microscopes. The results obtained in electrochemical method shown that PAni nanoparticles could be archived by transformation from its traditional fibrous structure using a bulky dopant as organic acid (oxalic acid), an oxydable subtract (iron) and an additional less electro-active monomer (diamino-naphthalene : DAN). The nano-size of PANi particles synthetized in chemical method could be controlled by using supersonic stirring conditions and participation of additional metallic oxide particles (ZnO).