Facile synthesis of Fe3O4@PPy core-shell magnetic nanoparticles and their enhanced dispersity and acid stability

We report a facile method to synthesize polypyrrole-coated Fe 3 O 4 core-shell magnetic nanoparticles (Fe 3 O 4 @PPy). First, crude Fe 3 O 4 nanoparticles were synthesized by co-precipitation approach. PPy layers were generated and deposited on the surface of Fe 3 O 4 via in-situ electropolymerization and electrodeposition , to construct core-shell structure nanoparticles. TEM observations showed the Fe 3 O 4 nanoparticles changed from 15   nm to 120   nm in diameter after the PPy coating. The composition and morphology of Fe 3 O 4 @PPy nanoparticles were characterized by advanced spectroscopic and imaging techniques. The Fe 3 O 4 @PPy nanoparticles possess good dispersion property and acid stability in strong acid aqueous. The magnetic measurement at room temperature indicates that the Fe 3 O 4 @PPy nanoparticles exhibit superparamagnetic behavior, holding the saturation magnetization of 43.5   emu/g. All the results show great potentials of the Fe 3 O 4 @PPy nanoparticles in wide range of applications.