Chế tạo và khảo sát khả năng kháng khuẩn của vật liệu nano bạc với hình dạng và kích thước khác nhau

Abstract

In this study, silver nanoparticles with different sizes and shapes were synthesized by a polyol method. The formation of silver nanoparticles was determined by employing different characterization methods such as ultraviolet–visible spectroscopy (UV-Vis), field emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD). It was found that in the ethylene glycol/PVP media, silver nanoparticles were spherical and their average particles sizes (21 nm, 85 nm) depended on the amount of silver nitrate while most silver nanoparticles were rod – shapes with the present of anions Cl-. The antibacterial activities of 21-nm, 85-nm silver nanoparticles and silver nanorods were processed by counting colonies on agar petri disks method, determining minimum inhibitory concentration (MIC). It was found that 21-nm, 85-nm silver nanoparticles and silver nanorods were good antibacterial effects on Escherichia coli. 21-nm silver nanoparticles were the best antibacterial effect on Staphylococcus aureus (MIC = 7,5 µg/mL) while silver nanorods did not show antibacterial activity on Staphylococcus aureus.