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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 3.

Figure 3

(a) Absorption profile of modified gold nanoparticles before and after addition of different concentrations of Hg(II) ions. (b) Photographic images of color of MPA–PDCA-modified gold nanoparticles (13 nM) in presence of different concentration of Hg (II) ion, (1) 3 ppm, (2) 6 ppm, (3) 10 ppm, (4) 50 ppm.