Green synthesis of nanomaterials finds the edge over chemical methods due to its environmental
compatibility. The present study deals with the green synthesis of silver (AgNPs) nanoparticles
using the aqueous extract of Alstonia scholaris without any catalyst, template, surfactant or any intermediate.
The method was well controlled using ultrasonic cavitation so as to facilitate the high level of
dispersion with an increase in rate of reaction. AgNPs was synthesized using silver nitrate in aqueous
extract of Alstonia scholaris as a reducing agent. The size of AgNPs can be tuned using
significant variation in reaction parameters. The as-synthesized nanomaterials were characterized
using UV-visible spectroscopy, X-ray diffraction (XRD), Transmission electron microscopy (TEM), Field emission
scanning electron microscope (FE-SEM) and Fourier transform infra-red spectroscopy. The optimized condition produces
the AgNPs of size ~15-38 nm. The presence of aldehydic and ketonic compounds (alkaloids, flavonoids, pinocarvone and
cryptone) potentially acts as reducing as well as stabilizing agents. Moreover, reduction of silver nitrate under controlled
ultrasonication shows the implosive collapsing of bubbles, which results in attaining a very high temperature of solution
with fast cooling at RT. Due to this uniform dispersion there are less chances of agglomeration of nanoparticles.