The stability of silver nanoparticles: Effect of the synthesis and storage time Muhamad Allan Serunting(a,b), Muhammad Ali Zulfikar (a), Henry Setiyanto (a*)
a) Analytical Chemistry Research Group, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia
*setiyanto[at]itb.ac.id
b) Department of Chemical Sciences, Faculty of Sciences, Institut Teknologi Sumatera, Lampung, 35365, Indonesia
Abstract
Silver nanoparticles (AgNPs) were successfully synthesized with an efficient green route using the kabau pod extract as a reducing and capping agent. The optimum synthesis was at pH 8 near the pH of the aquadest and at a concentration of 1 mM AgNO3. It is also optimal to do it under direct sunlight rather than in the dark or at room temperature. Several characterization instrument parameters were used to confirm the formation of silver nanoparticles. Surface plasmon resonance (SPR) spectra measured using a UV-Vis spectrophotometer peaked at 421 nm, confirming that silver nanoparticles were successfully synthesized. Measurement of the size distribution and zeta potential of nanoparticles using dynamic light scattering (DLS) showed that the resulting silver nanoparticles were mono dispersion is 58.9 nm with a polydispersity index (PdI) of 0.283 and stable for more than 3 months. The zeta potential value is -32.2 mV. The chemical reduction occurs due to the kabau pods extract containing phytochemical compounds (alkaloids, flavonoids, tannins, phenolics, and steroids). In addition, it was also confirmed by the Fourier transformation infrared (FTIR) instrument showing vibrations in the hydroxyl group- carboxyl and amine are involved as reducing and stabilizing agents. AgNPs are also characterized using X-Ray diffraction (XRD).
Keywords: Silver Nanoparticles, Green synthesis, Kabau pod extract
