Structural and Optical Properties of Gold Nanoparticles Formed by Wet-Chemical Method

trihydratewas taken as metal precursor, ascorbic acid at the presence of an appropriate amount of NaOH as reducing agent and polyvinylpyrrolidonek-30 (PVP K-30) as a stabilizing and capping agent. The reaction was performed in high-speed stirring rate at room temperature.Scanning electron microscopy (SEM with EDAX), X-ray diffraction (XRD) and DRS UV-Vis analysis have been used for characterization of the sample. SEM images shows formation of spherical shape nanoparticles. X-ray diffraction (XRD) measurements showed that the nanoparticles are crystalline and mainly composed of face-centered cubic (FCC). Using the Debye-Scherer formula average particle size of nanoparticles was calculated to be about 4.28 nm. UV-Vis absorption spectrum reveals the formation of gold nanoparticles by showing surface plasmon absorption maxima at 500 nm.