Electromagnetic and microwave absorbing properties of magnetite nanoparticles decorated carbon nanotubes/polyaniline multiphase heterostructures
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Magnetite nanoparticles decorated CNTs/PANI multiphase heterostructures were prepared by polymerization of aniline monomer and an additional process of the coprecipitation of Fe2+ and Fe3+. Scanning electron microscopy and transmission electron microscopy observation indicated that the monodispersed magnetite nanoparticles were uniformly decorated on the surface of CNTs/PANI. The formation of magnetite nanoparticles on CNTs/PANI was mainly through a preferentially position-selective precipitation process. More interestingly, a portion of Fe3O4 nanoparticles was found to form core–shell structures with PANI. The effects of different additional amounts of NH2Fe(SO4)2·6H2O reactant on the magnetic properties and microwave absorbing performances of CNTs/PANI/Fe3O4 heterostructures were investigated. The CNTs/PANI/Fe3O4 multiphase heterostructures were proved to be superparamagnetic. The microwave absorption measurement showed that the CNTs/PANI/Fe3O4 samples under 1.5 g of NH2Fe(SO4)2·6H2O condition exhibited much more effective absorption performance. These results suggested the novel CNTs/PANI/Fe3O4 multiphase heterostructures with PANI as the second phase may be potential candidate for microwave absorption systems.
KeywordsPANI Dielectric Loss Fe3O4 Nanoparticles Microwave Absorption Magnetite Nanoparticles
This work was supported by the National Science Foundation of P. R. China (Grant 50972014, 51072024 and 51132002).
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