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Figure 7 | Nanoscale Research Letters

Figure 7

From: Magnetic Iron Oxide Nanoparticles: Synthesis and Surface Functionalization Strategies

Figure 7

Synthetic scheme for the preparation of the three-layer NPs (left); TEM images of colloids after each synthetic step. a b SiO2 particles covered with silica-primed Fe3O4 NPs (SiO2–Fe3O4). c d SiO2 particles covered with silica-primed Fe3O4 NPs and heavily loaded with Au nanoparticle seeds (SiO2–Fe3O4–Au seeds). e Three-layer magnetic NPs synthesized in a single-step process from particles presented in (c) and (d). Note the uniformity of the gold shell. The inset shows the three-layer magnetic NPs drawn to the wall with a magnet. From [125]

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