MAGNETIC NANOPARTICLES;
SELECTIVE SYNTHESIS;
SIZE;
SHELL;
PARTICLES;
SHAPE;
D O I:
10.1021/cg8013199
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
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 ALL in the range 2-3 nm are attached to an-Line 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.