Figure 2.

Synthesis, characterization, and optical and photothermal properties of Ag NPs. (a): Absorption spectra of NPs in the wavelength range of 350–800 nm, obtained by spectrophotometry during the 240 min incubation of an aqueous solution of silver nitrate (1 g/L) and plant extract at 0.5–30% concentrations. (b): Electron micrographs of Ag NPs obtained by scanning electron microscopy (scales, 100 nm). (c): Histograms of the distribution of NP number (%) by size (nm). (d): Dynamics of temperature change (°C) of different NP concentrations (g/L) under the irradiation with a LED matrix at a power of 95, 75, and 34 mW/cm².