Facile and Green Approach To Fabricate Gold and Silver Coated Superparamagnetic Nanoparticles

• Main Authors: Chin, S.F., K., Swaminathan Iyer, Raston, Colin L.
• Format: Article
• Language: English
• Published: American Chemical Society 2009
• Subjects: QD Chemistry
• Online Access: http://ir.unimas.my/id/eprint/9881/1/Facile.pdf; http://ir.unimas.my/id/eprint/9881/; http://www.researchgate.net/publication/231232512_Facile_and_Green_Approach_To_Fabricate_Gold_and_Silver_Coated_Superparamagnetic_Nanoparticles
• Institution: Universiti Malaysia Sarawak

Superparamagnetic magnetite nanoparticles are coated with homogeneous gold and silver shells using a simple aqueous based seed mediated method at room temperature with dopamine as a surfactant. Nanoparticles of Au in the range 2-3 nm are attached to amine functionalized Fe3O4 nanoparticles, acting as seed for the growth of ultrathin Au or Ag shells. The monodispersed core-shell nanoparticles Fe3O4@Au and Fe3O4@Ag have a particle size range of 10-13 nm with a shell thickness of approximately 2-3 nm. They are magnetically purified and are superparamagnetic at 300 K with saturated magnetization values of 41 and 35 emu g-1, respectively.