Abstract
To increase the magnetic performance of multi-wall carbon nanotubes (MWCNTs)/Fe3O4 nanocomposites, Fe3O4-polymer-MWCNTs with a novel nanostructure was prepared by in-situ method. The low molecular weight poly (acrylic acid) was grafted on the surface of acid-oxidized MWCNTs, forming numerous carboxyl groups from the original hydroxyl groups on the surface of acid-treated MWCNTs. And then, the ferric and ferrous ions would be adsorbed on the surface of PAA-g-MWCNTs through the electrostatic interaction. At last, the ammonia solution was added into the above solution to form Fe3O4 nanoparticles on the surface of MWCNTs through hydrothermal treatment. The experimental results showed that large quantities of Fe3O4 nanoparticles were coated on the surface of PAA-g-MWCNTs via in-situ method and our products possessed high magnetic saturation and magnetic sensitivity.
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