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. Author manuscript; available in PMC: 2013 Sep 13.
Published in final edited form as: J Am Chem Soc. 2008 Jun 3;130(25):8038–8043. doi: 10.1021/ja801412b

Figure 5.

Figure 5

(a) Photographic images of color of MPA–HCys–PDCA-modified gold nanoparticles in presence of different metal ions with 40 ppm concentration. (b) HRS intensity change upon the addition of 40 ppm different metal ions on gold nanoparticle–MPA–HCys–PDCA solution (5 nM)