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Journal of Nanophotonics • Open Access

Femtosecond spectroscopy on MoS2 flakes from liquid exfoliation: surfactant independent exciton dynamics
Author(s): Daniele Vella; Victor Vega-Mayoral; Christoph Gadermaier; Natasa Vujicic; Tetiana Borzda; Peter Topolovsek; Matej Prijatelj; Iacopo Tempra; Eva Arianna Aurelia Pogna; Giulio Cerullo

Paper Abstract

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.

Paper Details

Date Published: 5 November 2015
PDF: 8 pages
J. Nanophoton. 10(1) 012508 doi: 10.1117/1.JNP.10.012508
Published in: Journal of Nanophotonics Volume 10, Issue 1
Show Author Affiliations
Daniele Vella, Jožef Stefan Institute (Slovenia)
International Postgraduate School (Slovenia)
Victor Vega-Mayoral, Jožef Stefan Institute (Slovenia)
International Postgraduate School (Slovenia)
Christoph Gadermaier, Jožef Stefan Institute (Slovenia)
International Postgraduate School (Slovenia)
Natasa Vujicic, Jožef Stefan Institute (Slovenia)
Institute of Physics (Croatia)
Tetiana Borzda, Jožef Stefan Institute (Slovenia)
International Postgraduate School (Slovenia)
Peter Topolovsek, Jožef Stefan Institute (Slovenia)
Italian Institute of Technology (Italy)
International Postgraduate School (Slovenia)
Matej Prijatelj, Jožef Stefan Institute (Slovenia)
International Postgraduate School (Slovenia)
Iacopo Tempra, Politecnico di Milano (Italy)
Eva Arianna Aurelia Pogna, Politecnico di Milano (Italy)
Giulio Cerullo, Politecnico di Milano (Italy)


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