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. Author manuscript; available in PMC: 2017 Jan 20.
Published in final edited form as: J Mater Chem B. 2015 Dec 7;4(3):513–520. doi: 10.1039/C5TB02243F

Fig. 1.

Fig. 1

Synthesis and characterization of HGNPs. A) Synthesis of GNPs and HGNPs. B) Transmission electron microscopy (TEM) image of GNPs (scale bar: 20 nm) and photograph of the GNP solution. C) The hydrodynamic diameter of GNPs analyzed by dynamic light scattering (DLS). D) TEM image of HGNPs (stained with 2% phosphotungstic acid, pH = 6.0, scale bar: 20 nm) and photograph of the HGNP solution. E) The hydrodynamic diameter of HGNPs obtained by DLS analysis.