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Synthesis and Characterization of Ultrathin Silver Sulfide Nanoplatelets

Kubie, L, King, LA ORCID logoORCID: https://orcid.org/0000-0002-0772-2378, Kern, ME, Murphy, JR, Kattel, S, Yang, Q, Stecher, JT, Rice, WD and Parkinson, BA (2017) Synthesis and Characterization of Ultrathin Silver Sulfide Nanoplatelets. ACS Nano, 11 (8). pp. 8471-8477. ISSN 1936-086X


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© 2017 American Chemical Society. 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 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, atomic force microscopy, 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.

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