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5 November 2015 Femtosecond spectroscopy on MoS2 flakes from liquid exfoliation: surfactant independent exciton dynamics
Daniele Vella, Victor Vega-Mayoral, Christoph Gadermaier, Natasa Vujicic, Tetiana Borzda, Peter Topolovsek, Matej Prijatelj, Iacopo Tempra, Eva Arianna Aurelia Pogna, Giulio Cerullo
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Journal of Nanophotonics, Vol. 10, Issue 1, 012508 (November 2015). https://doi.org/10.1117/1.JNP.10.012508
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.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Daniele Vella, Victor Vega-Mayoral, Christoph Gadermaier, Natasa Vujicic, Tetiana Borzda, Peter Topolovsek, Matej Prijatelj, Iacopo Tempra, Eva Arianna Aurelia Pogna, and Giulio Cerullo "Femtosecond spectroscopy on MoS2 flakes from liquid exfoliation: surfactant independent exciton dynamics," Journal of Nanophotonics 10(1), 012508 (5 November 2015). https://doi.org/10.1117/1.JNP.10.012508
Published: 5 November 2015
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Cited by 6 scholarly publications.
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KEYWORDS
Molybdenum
Excitons
Picosecond phenomena
Femtosecond phenomena
Liquids
Spectroscopy
Absorption
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