| 초록 |
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 synthesis 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 be added to the nanoplate solutions and S- can contact to elemental Ag of the nanoplates, generating Ag2S. Interestingly, the reaction was initiated at the corner sites of hexagonal Ag nanoplates and spread to the center of the nanoplates. Absorption spectra of the Ag/Ag2S nanoparticles red shifted with increasing in intensity of the UV region when the sulfidation occurred. By adjusting the concentration of Na2S, ratio of S to Ag and morphology of the hybrid structures could be controlled. |
