Figure 1

Synthesis and characterization of the Fe3O4 @ Au-PEI.Ac-PEG-FA NSs.
(a) Schematic representation of the synthesis of the Fe3O4 @ Au-PEI.Ac-PEG-FA NSs. (b) UV-vis spectra of the aqueous solution of Fe3O4 @ Au-PEI.Ac-PEG-FA NSs before and after laser irradiation (inset shows the digital photo of the Fe3O4 @ Au-PEI.Ac-PEG-FA NSs in aqueous solution). (c) TEM image (inset is the high magnification TEM image), (d) size distribution histogram and (e) high-resolution TEM image (only an Au spike is shown) of the Fe3O4 @ Au-PEI.Ac-PEG-FA NSs.