Synthesis of silver-doped zinc dioxide nanoparticles by sol-gel and coprecipitation techniques and comparison of physico-chemical properties and antibacterial activities of them
Subject Areas :mitra shabaninia 1 , Manouchehr Khorasani 2 , sahar baniyaghoob 3
1 - PhD student .Department of Chemistry,Science and Research branch ,Islamic Azad university ,tehran, iran
2 - Assistant Prof. of Department of Polymer Engineering Color & Coatings Industry, Amirkabir University ofTechnology
3 - Department of chemistry, Science and research branch, Isalamic azad University, Tehran, Iran
Keywords: Silver-doped zinc dioxide nanoparticles, Sol-gel, Coprecipitation, Antibacterial activity,
Abstract :
In this research, silver-doped zinc oxide nanoparticles were synthesized using sol-gel and coprecipitation methods and the antibacterial behavior of them was evaluated. Fourier transform infrared spectroscopy (FTIR) identified the functional groups of synthesized samples and confirmed that Ag was doped well into ZnO nanoparticles. X-ray diffraction (XRD) confirmed the hexagonal wurtzite structure for the nanoparticles synthesized by using both methods. Surface morphology, particle size and composition of Ag-ZnO nanoparticles were studied by scanning electron microscope (SEM). The SEM images showed the agglomerations of the particles synthesized by using both methods but in sol-gel method morphology of nanoparticles depended on pH of precursor. Morphology changes from irregular forms of sheet-shaped to rod-shaped nanoparticles was observed when pH increased from 7 to 10. Antibacterial behaviors of the synthesized nanoparticles against Escherichia coli (E. Coli) as a gram-negative bacteria and Staphylococcus aureus as a gram-positive bacteria were evaluated by disk diffusion test method, and it was observed that the antibacterial activity of ZnO improved by Ag doping. Our results showed that synthesized nanoparticles show more antibacterial activity against S. aureus than E. Coli.
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