Research Article
Plasmonic Sensing of Aqueous-Divalent Metal Ions by Biogenic Gold Nanoparticles
Figure 4
(a) UV-Vis spectra of biogenic AuNPs (synthesized with 5 mL of a 10-3 M HAuCl4 solution and 0.4 mL of Camellia sinensis extract) interacting with Mg2+, Hg2+, Sr2+, Pb2+, Ca2+, Cu2+, and Zn2+ metal ions. (b) TEM images of (1) AuNPs, (2) AuNPs-Zn2+, (3) AuNPs-Sr2+, (7) AuNPs-Ca2+, and (8) AuNPs-Cu2+. (c) Picture of vials having AuNPs (synthesized with 5 mL of a 10-3 M HAuCl4 solution and 0.4 mL of Camellia sinensis extract) and the different metal ions probed, respectively.
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