Polyaniline (PANI)/graphene (GN) nanocomposites were synthesized by in-situ chemical oxidative polymerization method. A series of nanocomposites have been synthesized by varying the concentration of functionalized graphene (1%, 3% and 5%). The as-prepared nanocomposites were characterized by XRD and SEM. The results showed favorable interaction between PANI and GN. The electrical conductivity of nanocomposites was found to be drastically increased as compared to that of pure PANI at room temperature. Further the conductivity of nanocomposites was also found to be increased with the increase in weight % of GN. Nanocomposites showed semiconducting nature as that of PANI with improved properties for EMI shielding. The EMI shielding effectiveness (SE) of nanocomposites was found to be increased with increasing GN content and it was found to be absorption dominated indicating PANI/GN nanocomposites can be used as lightweight EMI shielding materials to protect electronic devices and components from electromagnetic radiation.
Carbon is always a fascinating material, the allotropes of carbon family like fullerenes, graphite, graphene, carbon nanotubes and various fillers that improves the Electromagnetic interference (EMI) shielding is of large interest in various frequency band. In the present work, initially Multiwalled Carbon Nanotubes (MWCNT) and Graphene (GNS) were functionalized to improve the interaction of conducting polymer. Polyaniline (PANI)/(MWCNT) and Polyaniline (PANI)/(GNS) were synthesized by in situ oxidative polymerization method and then characterized by SEM analysis. The electrical conductivity of the nanocomposites increases with increase in weight percent of CNT or GNS as compared to pure polyaniline. The carbon based conducting polymer nanocomposites showed semiconducting nature with enhanced EMI shielding effectiveness. The EMI Shielding effectiveness (SE) of carbon based conducting polymer nanocomposites increases with increase in weight percent of CNT or GNS. For both the nanocomposites PANI/MWCNT and PANI/GNS absorption is the mechanism which is dominant which can be used as an Electromagnetic Interference Shielding material.
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