EastWest Chemistry Conference , Lviv, Ukraine, 10 - 12 October 2018, pp.131
There is an increasing commercial demand for nanoparticles due to their wide applicability in various areas such as electronics, catalysis, chemistry, energy and medicine. The present study reports an eco-friendly, cost efficient, rapid and easy method for synthesis of gold nanoparticles using Cotinus Coggygria leaf extract (CCLE) as a reducing and capping agent. The different factor affecting gold reduction was investigated. The optimum conditions were; auric acid solution:1mM, CCLE:20g dry weight/250 mL,volume ratio of auric acid solution and leaf extract solution: 24.8/0.2, pH:3, reaction temperature:60°C, and reaction time:15 min.CCLE can reduces gold ions into gold nano-particles within 10-15 min after heating the reaction mixture at 60°C as indicated by the developed dark purple co-lor.The gold nanoparticles obtained were characterized by UV–Vis spectroscopy, photoluminescence, transmission electron microscopy (TEM), and Fourier transform infrared(FTIR)spectroscopy. Synthesis of Au-Nps was confirmed in UV–Visible spectroscopy at the range of approximately 530-635 nm. FTIR measurements affirmed the Au-NPs having a coating of the extract compounds indicating a possible role of phenolic groups for capping and stabilization of the gold nanoparticles. The photoluminescence measurements revealed the oxidation of the extract compounds during the process of Au3+ reduction. In fluorescence spectroscopy study, Au-NPs in CCL extract shows
fluorescence emission at 445 and 705 nm when excited at 350 nm. The TEM micrograph showed that the gold nanoparticles are spherical with average particle size ∼17 nm. It has been revealed that the prepared nanoparticles are within 17 nm, having four months-long stability The Au-NPs showed antibacterial activities against both gram positive (Staphylococcus aureus) and gram negative (Escherichia coli) microorganisms.