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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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
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container_title Journal of nanophotonics
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creator Vella, Daniele
Vega-Mayoral, Victor
Gadermaier, Christoph
Vujicic, Natasa
Borzda, Tetiana
Topolovsek, Peter
Prijatelj, Matej
Tempra, Iacopo
Pogna, Eva A. A
Cerullo, Giulio
description 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.
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title Femtosecond spectroscopy on MoS2 flakes from liquid exfoliation: surfactant independent exciton dynamics
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