Abstract
This study describes the synthesis of silver (Ag) and silver aluminate (AgAlO2) nanoparticles (NPs) by a facile and low-cost flash method. X-ray diffraction measurements showed that the Ag NPs had a single-phase cubic spinel structure, whereas the AgAlO2 NPs exhibited a hexagonal structure. Field-emission scanning electron microscopy showed that, by adding Al ions to the Ag NPs, the grain size increased. The saturation magnetization (Ms) and magnetic susceptibility (χ) of the AgAlO2 NPs were 1.6 and 2.3 times higher, respectively, than those of the Ag NPs. In addition, the coercivity (Hc) of the AgAlO2 NPs was 3.1 times lower than that of the Ag NPs, which enables the application of Ag NPs in magnetic targeting of tumors and separators, whereas the application of AgAlO2 NPs is enabled in magnetic field sensors. Antimicrobial tests showed that Ag and AgAlO2 NPs exhibited significant activity against bacterial microorganisms; however, only the Ag NPs exhibited significant activity against fungal microorganisms. In particular, the Ag NPs were highly active against Bacillus strains and Candida albicans yeast, whereas the AgAlO2 NPs exhibited strong activity against Staphylococcus aureus. Therefore, the Ag and AgAlO2 nanoparticles, using this facile and low-cost method, are highly suitable for applications in antibacterial drugs, and the Ag NPs can also be applied as antifungal drugs.
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