光致发光
材料科学
透射电子显微镜
吸收光谱法
量子点
光谱学
光电流
硫化物
硫化银
乙二醇
量子产额
吸收(声学)
分析化学(期刊)
纳米技术
化学工程
荧光
光电子学
化学
光学
有机化学
复合材料
工程类
冶金
物理
量子力学
作者
Lenore Kubie,Laurie A. King,Meghan E. Kern,Joseph R. Murphy,Subash Kattel,Qian Yang,Joshua T. Stecher,William Rice,B. A. Parkinson
出处
期刊:ACS Nano
[American Chemical Society]
日期:2017-08-09
卷期号:11 (8): 8471-8477
被引量:20
标识
DOI:10.1021/acsnano.7b04280
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 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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