Figure 3.

Different pH values change the UV–vis spectra of the AgNPs. Absorption spectra of the AgNPs exposed to deionized water with different concentrations of peptone (A) and exposed to different pH (B).

Different pH values change the UV–vis spectra of the AgNPs. Absorption spectra of the AgNPs exposed to deionized water with different concentrations of peptone (A) and exposed to different pH (B).