Reduction mechanisms of Ag(I) and Au(III) in the synthesis of silver and gold nanoparticles using leaf extract of Terminalia catappa

Synthesis of silver nanoparticles (AgNP) and gold (AuNP) was carried out by the reduction method with leaf extract Ketapang (Terminalia catappa). The biomolecules present in generated Ag+ Au3+ ions from AgNO3 HAuCl4, respectively. growth monitored UV-Vis spectrophotometer. maximum absorption biosynthesis AgNP AuNP were observed respective range 421-431nm 530-535nm. Those peaks correspond to surface plasmon absorbance AuNP, Analysis on functional groups change Fourier Transform Infra Red (FTIR) Spectroscopy showed formation carbonyl- hydroxyl-groups which suggested oxidation processes involved both nanoparticles. average size distributions determined PSA (Particle Size Analyzer) are 55-71nm 18-44nm for Morphology Scanning Electron Microscope (SEM) structure compounds characterized using X-ray Diffraction (XRD). shape varied triangular, cubic hexagonal polyshaped, while spherical. XRD studies that obtained crystalline silver.