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Abstract
Conductive polymers or, intrinsically conducting polymers (ICPs) are organic polymers that can have metallic conductivity or semiconductivity via conjugation and co-doping. Polypyrrole (PPy) as a kind of heterocyclic conjugated conductive polymers is considered to be the most prospective electric conductive polymer due to its relatively high conductivity, stability, and other characteristics. Recently, PPy /magnetic nanoparticles composite materials have become a research hotspot, for its potential application in electromagnetic shielding, molecular electronics, nonlinear optics, absorbing materials, etc. The preparation of this material is mainly through in-situ polymerization. The polymer wrapped around nanoscale magnetic particle via particle-substrate interaction to form a core-shell structure of polymer /magnetic nanoparticles composite materials. But study also shows that this kind of polymer coat may reduce the saturation magnetization of the magnetic nanoparticles.
Three methods—chemical method, electrochemical and O/W microemulsion synthesis method were used to synthesize different structural types of PPy. The Four probe method shows that it has good conductivity (793.7 S.m-1).The TEM indicates that the PPy synthesized through O/W microemulsion has better controlled nano size and thus we chose the PPy synthesized by O/W microemulsion to interact with magnetic Co nanoparticles via ligand substitution reaction. The PPy/ magnetic nanoparticles composite material has unique structure with Co attach to the surface of PPy. Magnetic measurement shows that the after conjugation with PPy, the originally superparamagnetic cobalt nanoparticles display ferromagnetism, which proves that the PPy enhance magnetism of cobalt magnetic; the four probe method also shows the increased conductivity of the composite which proves that the cobalt nanoparticles, also increase PPy’s conductivity.
Key Words:Polypyrrole (PPy), O/W microemulsion, PPy/ magnetic nanoparticles composite materials

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