Indonesia Conference Directory

Matoa leaves, beside of their medicinal properties it can so be used for biosynthesis of silver nanoparticles. The factors that play role in the biosynthesis process is pH. Therefore, this study carried out the biosynthesis of silver nanoparticles using leaves extract of Matoa and the effect of pH on the shape, size and stability of the silver nanoparticles. Biosynthesis was carried out by mixing 2% Matoa extract and 1 mM AgNO3 solution which then incubated for 24 hours. There are four variations of pH used, 4, 7, 9 and 11. Silver nanoparticles were characterize based on color changes, UV-Vis spectrophotometers, TEM (Transmission Electron Microscopy), and PSA (Particle Size Analyzer). The photos and UV-Vis spectra of pH treatment showed a change in the color of the solution to yellow-brown and had absorption at a wavelength of 400-500 nm indicating the formation of silver nanoparticles. The TEM results showed that the boiled water of the Matoa leaves tend to have spherical silver nanoparticles. The higher the pH of the reaction environment, smaller silver nanoparticles formed, and the stability of the silver nanoparticles produced tends to be unstable except for AgNP in pH 9 which is moderately stable and has a good monodispersity.