Rapid synthesis of gold nanoparticles without heating process

Abstract

Several methods have been developed to synthesize gold nanoparticles (AuNPs), but it is not effective since a high temperature and long time reaction are required. This research developed a rapid and simple synthesis of gold nanoparticles at room temperature using a green reducing agent, L-ascorbic acid. The AuNPs could be synthesized using this method only in 2 s without assisted ultrasonic bath or another reactor. The effects of the concentration of HAuCl4 and L-ascorbic acid, pH and time reaction were investigated in this work. The AuNPs were characterized with the UV-visible spectroscopy, transmission electron microscopy and X-ray diffraction. The UV-visible spectroscopy confirmed surface plasmon resonance (SPR) of AuNPs at 524-535 nm, depends on the synthesis parameters. The TEM result showed that the AuNPs synthesized was monodisperese and have a spherical shape. The XRD measurement performed that AuNPs has a crystallite phase with correspond to the fcc structure of gold nanocrystal. The information obtained in this experiment can be used to design AuNPs synthesis without heating step. Moreover, the method is green, effective and efficient.