Research Article
A Highly Sensitive and Selective Colorimetric Hg2+ Ion Probe Using Gold Nanoparticles Functionalized with Polyethyleneimine
Figure 7
(a) Photographic image of the Whatman paper added with PEI-AuNP solution and dried. (b) Photographic image of the Whatman paper added with 0.1 ppm·Hg2+ ion solution.
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