Enhanced antimicrobial activity of Zinc oxide nanoparticles with controled particle size by current density
Keywords:
electrochemical reduction method, current density, ZnO NPs, particle size, Tetrabutyl ammonium bromide,, antimicrobalactivityAbstract
In this study, it was found that by using electrochemical reduction method, the current density have played important role in controlling size and shape of ZnO nanoparticles. Where it were synthesized at 9 and 18 mA /cm2. The results of charaterization indicated metallic nature and absorption peak in the UV region. FTIR and EDX confirmed formation of ZnO and removing of capping agent after calcination , XRD, FESEM and HRTEM showed that size of ZnO nanoflower and nanosheets to be 46.54 nm and 37.3 nm at 9 and 18 mA /cm2 respectively. ZnO NPs is pure and polycrystalline with a hexagonal wurtzite phase. The in vitro antibacterial properties of two synthesized ZnO NPs against two types of bacteria; Gram-postive(staphylococcus aureus) and Gram-negtive(xanthomonas) were examined by diffusion method. It was noticed that the smallest-sized ZnO NPs demonstrated a better antibacterial activity against both bacterial strains as compared to the larger ZnO NPs, the inhibitory effect of ZnO NPs increased with the increase in concentration of ZnO NPs.
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