Self-assembled core-shell Fe3O4-Pt nanoparticles via silylation/polymerization-based amino-functionalization
Jae Uk Hur, Jae Rok Shin, Jin Soon Han, Young Hwan Kim, Gye Seok An
Abstract
Core-shell structured Fe3O4-Pt nanoparticles were conveniently manufactured using the self-assembly method based on electrostatic interactions. Electrostatic connection between Fe3O4 and Pt was achieved by silylation/polymerization-based surface amino-functionalization of the magnetic core (Fe3O4) using silane or polymer precursors: (3-aminopropyl) triethoxysilane (APTES) and polyethyleneimine (PEI). The shape of the shell (Pt) and the specific gravity of a single Fe3O4-Pt nanoparticle changed according to the relative intensity of the surface charge expressed by the amino precursor and the structure of the crosslinking agent. Consequently, the formation of the Pt shell depended on the number of terminal amino functional groups as binding sites, as well as electrostatic attraction due to the strong zeta potential.