“9.61x6.69” b2815 Tissue Engineering and Nanotheranostics
Magnetic Nanohybrids for Magnetic Resonance Imaging 125
Fig. 16. Schematic presentation for the synthesis of Au–Fe 3 O 4 plasmonic–magnetic
hybrid nanoparticles. (a) and (b) TEM and HRTEM images of heterodimer or
dumbbell-like nanoparticles, (c) and (d) TEM image of Au–FexOy HSs and after
leaching gold from the Au–FexOy dumbbells, (e) and (f) TEM image of the Au–FexOy
axe-like morphology and corresponding image after leaching Au from the Au–FexOy
hybrid structures. Reprinted with permission from Ref. 87.^
SiO 2 coating (Fig. 17(d)). The obtained product was well dispersed
in aqueous medium for biological applications.
Another example of magneto–plasmonic hybrid structure is Ag–
Fe 3 O 4 NPs which can be synthesized by controlled nucleation of Ag
on the surface of Fe 3 O 4 NPs (Fig. 18(a)).^90 In facile synthesis,
Fe 3 O 4 NPs dispersed in hexane were mixed with aqueous dispersed
AgNO 3. The water and hexane are immiscible and the sonication
process destroys the hexane layer into tiny droplets that produced
microemulsion in the AgNO 3 solution. Similar types of structures
were also observed in the literature.91,92
The Fe 3 O 4 NPs accumulated at the liquid/liquid border and acted
as catalytic centers which were favorable for the growth/nucleation of
