UV-Vis analysis:
In this study, silver nanoparticles were formulated at a temperature of
80 °C and a duration of 30 minutes. The reaction solution color changed
from dark red to black due to the interaction between the plant extract
and the silver salt solution, and it is the first sign of producing
silver nanoparticles, was quite evident. After that, the absorption
spectrum of the nanoparticle solution using a spectrophotometer showed a
peak wavelength of about 442 nm, which shows the silver nanoparticle
presence (Figure 6). The above findings in the present study proved that
the color change is a function of time and with the passage of time and
the progress of the reaction, the concentration of silver nanoparticle
increases. By measuring the optical density of the reaction solution in
different time intervals, we came to the conclusion that the rise in the
silver nanoparticle concentration causes the color of the reaction
solution to change to black.