title: High magnetisation, monodisperse and water-dispersible CoFe@Pt core/shell nanoparticles.
abstract: High magnetisation and monodisperse CoFe alloy nanoparticles are desired for a wide range of biomedical applications. However, these CoFe nanoparticles are prone to oxidation, resulting in the deterioration of their magnetic properties. In the current work, CoFe alloy nanoparticles were prepared by thermal decomposition of cobalt and iron carbonyls in organic solvents at high temperatures. Using a seeded growth method, we successfully synthesised chemically stable CoFe@Pt core/shell nanostructures. The obtained core/shell nanoparticles have high saturation magnetisation up to 135 emu g-1. The magnetisation value of the core/shell nanoparticles remains 93 emu g-1after being exposed to air for 12 weeks. Hydrophobic CoFe@Pt nanoparticles were rendered water-dispersible by encapsulating with poly(maleic anhydride-alt-1-octadecene) (PMAO). These nanoparticles were stable in water for at least 3 months and in a wide range of pH from 2 to 11.
authors.affiliation: Institute for Tropical Technology (ITT)-Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam. ltlu@itt.vast.vn.
authors.forename: Ngo T
authors.initials: NT
authors.lastname: Dung
authors.forename: Nguyen Viet
authors.initials: NV
authors.lastname: Long
authors.forename: Le T T
authors.initials: LTT
authors.lastname: Tam
authors.forename: Pham H
authors.initials: PH
authors.lastname: Nam
authors.forename: Le D
authors.initials: LD
authors.lastname: Tung
authors.forename: Nguyen X
authors.initials: NX
authors.lastname: Phuc
authors.forename: Le T
authors.initials: LT
authors.lastname: Lu
authors.forename: Nguyen Th
authors.initials: NT
authors.lastname: Kim Thanh