Preparation of Multilayered Core-Shell Fe₃O₄-SnO₂-C Nanoparticles via Polymeric/Silane-Amino Functionalization

Multilayered core-shell Fe₃O₄-SnO₂-C nanoparticles were prepared via surface treatment and carbonization at atmospheric pressure. Fe₃O₄-SnO₂ nanoparticles were prepared by the carboxylation of the pivotal particles (Fe₃O₄) with an anionic surfactant to immobilize SnO₂ nanoparticles. A method was proposed to externally surround hydrophilic carbon with amine-forming materials, polyethyleneimine (PEI), and (3-Aminopropyl) triethoxysilane (APTES). The synthesis strategy was based on the electrostatic bonding of the introduced amine group with the hydroxyl group on the carbon precursor and the carbonization of the coating layer by the catalytic reaction of sulfuric acid.