Synthesis of Ag-Ag2S Hybrid Nanoplates with Unique Heterostructure and Their Photocatalytic Application
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Ag-Ag2S nanostructures have attracted significant attention due to their synergistic properties that arise from the interaction between the two components. In this study, a new approach of site-selective sulfidation at the corner sites of hexagonal Ag nanoplates has been suggested. The synthesize of Ag-Ag2S hybrid nanostructures was conducted by adding sodium sulfide (Na2S) to hexagonal Ag nanoplates with poly(vinyl pyrrolidone) (PVP) as a stabilizer. As a precursor for elemental S, Na2S can directly contact to elemental Ag and generate Ag2S. Absorption spectra shows red shifting and decreasing in intensity from Ag nanoplates peak after the sulfidation occurred. By adjusting the concentration of Na2S, ratio of S to Ag and morphology of the hybrid structures can be controlled. These nanoparticles further used as photocatalyst for degradation of Methylene Blue resulting in high photocatalytic activity.