Synthesis and Characterization of Ultrathin Silver Sulfide Nanoplatelets

摘要

We report the synthesis of ultrathin silver sulfide (Ag2S) nanoplatelets (NPLs) synthesized via a One pot method in ethylene glycol with 3-mercaptopropionic acid serving as both the sulfur precursor and the platelet ligand. The colloidally synthesized nanoplatelets are exceptionally thin, with a thickness of only 3.5 +/- 0.2 angstrom and a IS exciton Bohr diameter to confinement ratio of similar to 12.6. The NPL growth is shown to be quantized by layer thickness using absorption and photoluminescence (PL) spectroscopy: Transmission electron microscopy, atomic force microscopy, and X-ray diffra:ction analyses of the NPLs show that they correspond to the (202) plane of the beta-Ag2S structure. The PL quantum yield of these NPLg is 30%, suggesting their potential use in biomedical imaging. Optoelectronic properties were evaluated via sensitized photocurrent spectroscopy with the resulting spectra closely matching the distinctive absorption spectral shape of the Ag2S NPLs.