Research Article
Plasmonic Sensing of Aqueous-Divalent Metal Ions by Biogenic Gold Nanoparticles
Figure 5
Absorption spectra changes of AuNPs upon addition of increasing concentrations, from 10-3 to 10-6 M of (a) Ca2+, (b) Cu2+, (c) Sr2+, and (d) Zn2+.
| (a) |
| (b) |
| (c) |
| (d) |