Synthesis and Characterization of Silver/Titanium dioxide Core-Shell Nanoparticles
Abstract
Silver nanoparticles (AgNPs) with mean diameter of 150 nm were synthesized by using an aqueous-basedreduction method. Ascorbic acid and sodium hydroxide (NaOH) were used as a reducing agent and as a
catalyst, respectively. These AgNPs were subsequently coated with a layer of TiO2 to form Ag/TiO2 core-shell
nanoparticles by using a sol-gel method. The particle sizes and morphology of Ag/TiO2 core-shell
nanoparticles were characterized using scanning electron microscopy (SEM) and transition electron
microscopy (TEM). The photocatalytic activity of the Ag/TiO2 core-shell nanoparticles were evaluated based
on the degradation of methylene blue (MB) as the model reaction. The TiO2 coating has resulted in the
enhanced photocatalytic activity of Ag nanoparticles as compared to bare Ag nanoparticles.
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