Synthesis and Characterization of Ultrathin Silver Sulfide Nanoplatelets.

Author(s) Kubie, L.; King, L.A.; Kern, M.E.; Murphy, J.R.; Kattel, S.; Yang, Q.; Stecher, J.T.; Rice, W.D.; Parkinson, B.A.
Journal ACS Nano
Date Published 2017 Jul 28
Abstract

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 platelet ligand. The colloidally synthesized nanoplatelets are exceptionally thin, with a thickness of only 3.5±0.2 Å , and a 1S exciton Bohr diameter to confinement ratio of ∽12.6. The NPL growth is shown to be quantized by layer thickness using absorption and photoluminescence (PL) spectroscopy. Transmission electron microscopy (TEM), atomic force microscopy (AFM), and x-ray diffraction analyses of the NPLs show that they correspond to the (202) plane of the β-Ag2S structure. The PL quantum yield of these NPLs 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.

DOI 10.1021/acsnano.7b04280
ISSN 1936-086X
Citation ACS Nano. 2017.

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