Fig. 1.
UV–Vis spectra of a HAuCl4 (0.42 mM), b–g AuNPs at 200, 400, 600, 800, 1000, 1200 mg/L concentrations of the stem bark of Nerium oleander. Inset: photograph of the vials containing the aforementioned mixtures (after 15 h of mixing)
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