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[en] Highlights: • Fe3O4@PPy core-shell nanoparticles were prepared by in-situ electropolymerization and electrodeposition method. • The Fe3O4@PPy nanoparticles possess satisfied dispersion property, acid stability, superparamagnetic behavior. • The saturation magnetization of the magnetic Fe3O4@PPy nanoparticles reached 43.5 emu/g. We report a facile method to synthesize polypyrrole-coated Fe3O4 core-shell magnetic nanoparticles (Fe3O4@PPy). First, crude Fe3O4 nanoparticles were synthesized by co-precipitation approach. PPy layers were generated and deposited on the surface of Fe3O4 via in-situ electropolymerization and electrodeposition, to construct core-shell structure nanoparticles. TEM observations showed the Fe3O4 nanoparticles changed from 15 nm to 120 nm in diameter after the PPy coating. The composition and morphology of Fe3O4@PPy nanoparticles were characterized by advanced spectroscopic and imaging techniques. The Fe3O4@PPy nanoparticles possess good dispersion property and acid stability in strong acid aqueous. The magnetic measurement at room temperature indicates that the Fe3O4@PPy nanoparticles exhibit superparamagnetic behavior, holding the saturation magnetization of 43.5 emu/g. All the results show great potentials of the Fe3O4@PPy nanoparticles in wide range of applications.