“…Daisy and team synthetized gold nanoparticles using Cassia fistula stem bark aqueous extract [ 52 ]. Gold nanoparticles have been greenly synthetized using many natural compounds [ 119 , 136 , 181 , 188 , 208 , 237 , 241 ]. In this study, numerous characterizations were carried out, including ultraviolet–visible spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy to investigate their absorbance pattern, the possible functional groups, the size of the nanoparticles, respectively.…”