Preyssler acid, H14[NaP5W30O110], was used as a green co-reducing agent for bio-synthesis of gold nanoparticles in the presence of marine algae Chaetomorpha linum, at room temperature. The prepared nanoparticles characterized by UV-Vis spectroscopy, particle size distribution, X-ray diffraction (XRD), and transmission electron microscopy (TEM). The effect of various parameters such as extract concentration as well as gold complex concentration, and time on the size of gold nanoparticles was investigated.The obtained results revealed that formation and size of nanoparticles can be controlled by considering these parameters. Our findings showed that, with the increasing the extract and gold complex concentrations, the size of nanoparticles is decreased and increased, respectively. Preyssler acid served as a co-reductant and stabilizer for the synthesis of gold nanoparticles and led to formation of gold nanoparticles in a shorter time. It was found that the particle size of obtained gold nanoparticles in the presence of Preyssler acid is smaller than in extract solution, which can be related to the rate of reduction reaction. It has been also observed that all solutions including nanoparticles are stable for few months.
Department of Chemistry, Mashhad Branch, Islamic Azad University, Mashhad, Iran.