title: Magnetite nanoparticles with tunable gold or silver shell.
abstract: Fe3O4 nanoparticles with size approximately 13 nm have been prepared successfully in aqueous micellar medium at approximately 80 degrees C. To make Fe3O4 nanoparticles resistant to surface poisoning a new route is developed for coating Fe3O4 nanoparticles with noble metals such as gold or silver as shell. The shell thickness of the core-shell particles becomes tunable through the adjustment of the ratio of the constituents. Thus, the route yields well-defined core-shell structures of size from 18 to 30 nm with varying proportion of Fe3O4 to the noble metal precursor salts. These magnetic nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), FTIR, differential scanning calorimetry (DSC), Raman and temperature-dependent magnetic studies.
authors.affiliation: Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India.
authors.forename: Madhuri
authors.initials: M
authors.lastname: Mandal
authors.forename: Subrata
authors.initials: S
authors.lastname: Kundu
authors.forename: Sujit Kumar
authors.initials: SK
authors.lastname: Ghosh
authors.forename: Sudipa
authors.initials: S
authors.lastname: Panigrahi
authors.forename: Tapan K
authors.initials: TK
authors.lastname: Sau
authors.forename: S M
authors.initials: SM
authors.lastname: Yusuf
authors.forename: Tarasankar
authors.initials: T
authors.lastname: Pal