Fig. 2

SEM images of the five types of synthesized tAgNPs, the particle size distribution plotted from the SEM images, and the UV–vis spectra at 420 nm. A: The particle size of tAgNPs is 25.1 nm and UV peak is 539 nm. B: The particle size of tAgNPs is 36.6 nm and the UV peak is 730 nm. C: The particle size of tAgNPs is 43.1 nm and the UV peak is 749 nm. D: The particle size of tAgNPs is 46.7 nm and the UV peak is 774 nm. E: The particle size of tAgNPs is 55.7 nm and the UV peak is 805 nm