PREPARATION AND INVESTIGATION OF GOLD NANOPARTICLES CAPPED BY DIFFERENT LIGANDS

摘要

A simple single-step synthesis of gold nanoparticles through reducing chloroaurate ions (AuCl_4-) with sodium borohydride (NaBH_4) in the presence of sodium folate, glutamic acid or sodium oleate as stabilizers has been developed. The structure of gold nanoparticles and optical properties of the prepared hydrosols were characterized by UV-visible spectroscopy, IR-spectroscopy and transmission electron microscopy. It was shown that gold nanoparticles capped by sodium oleate were instable and form aggregates on aging, while the nanoparticles capped by folate and glutamic acid were stable at ambient conditions.