Femtosecond spectroscopy on MoS2 flakes from liquid exfoliation: surfactant independent exciton dynamics

Ionic surfactants, which are widely used to stabilize nanomaterials in dispersions, can drastically alter the nanomaterial's photophysical properties. Here, we use femtosecond optical spectroscopy to study the dynamics of excitons and charges in few-layer flakes of the two-dimensional semicondu...

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Bibliographic Details
Published in:Journal of nanophotonics 2016-03, Vol.10 (1), p.012508-012508
Main Authors: Vella, Daniele, Vega-Mayoral, Victor, Gadermaier, Christoph, Vujicic, Natasa, Borzda, Tetiana, Topolovsek, Peter, Prijatelj, Matej, Tempra, Iacopo, Pogna, Eva A. A, Cerullo, Giulio
Format: Article
Language:English
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Summary:Ionic surfactants, which are widely used to stabilize nanomaterials in dispersions, can drastically alter the nanomaterial's photophysical properties. Here, we use femtosecond optical spectroscopy to study the dynamics of excitons and charges in few-layer flakes of the two-dimensional semiconductor MoS2. We compare samples obtained via exfoliation in water with different amounts of adsorbed sodium cholate, obtained by repeated washing of the dried flakes. We find that the femtosecond dynamics is remarkably stable against the surfactant adsorption, with a slight increase of the initial exciton quenching occurring during the first few picoseconds as the only appreciable effect.
ISSN:1934-2608
DOI:10.1117/1.JNP.10.012508