Synthesis of silver nanoparticles embedded on silica by gamma irradiation for utilization as antimicrobial agents
Main Article Content
Abstract
Silver nanoparticles deposited on silica (Ag nano/SiO2) have been prepared by Co-60 gamma irradiation of a mixture containing Ag+, SiO2, H2O and ethanol. The reduction of Ag+ within the SiO2 suspension was facilitated by e-aq and H· generated during the radiolysis of solvent (water/ethanol). The presence of SiO2 effectively prevented the clustering of Ag particles. The conversion dose (Ag+ - > Ag0) was investigated with UV-Vis spectroscopy. The results revealed that Ag nanoparticles with the sizes of 5-20 nm were formed from the mixture of 5 mM Ag+ as observed by Transmission electron microscopy (TEM). The crystal structure of Ag nanoparticles was further analyzed by using X-ray diffraction (XRD). In addition, the antifungal activity of Ag nano/SiO2 was also assessed against Aspergillus niger van Tieghem using plate count method. The results indicated that the antifungal efficacy of Ag nano/SiO2 reached approximately 64%, 71%, 81%, 82%, and 96% at Ag nanoparticle concentrations of 30 ppm, 50 ppm, 70 ppm, 100 ppm, and 150 ppm, respectively.
Article Details
Keywords
silver nanoparticles, silica, gamma irradiation, antimicrobial agent
References
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