Synthesis and Characterization of Ultrathin Silver Sulfide Nanoplatelets.
Lenore KubieLaurie A KingMeghan E KernJoseph R MurphySubash KattelQian YangJoshua T StecherWilliam D RiceBruce A ParkinsonPublished in: ACS nano (2017)
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.
Keyphrases
- electron microscopy
- quantum dots
- atomic force microscopy
- high resolution
- single molecule
- optical coherence tomography
- energy transfer
- high speed
- gold nanoparticles
- highly efficient
- visible light
- silver nanoparticles
- high efficiency
- optic nerve
- molecular dynamics
- metal organic framework
- dual energy
- solid state
- magnetic resonance
- density functional theory
- contrast enhanced
- risk assessment
- monte carlo