Surfactant-aided exfoliation of molybdenum disulphide for ultrafast pulse generation through edge-state saturable absorption
Woodward, Robert I
Kelleher, Edmund JR
Physica Status Solidi (B)
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Howe, R., Woodward, R. I., Hu, G., Yang, Z., Kelleher, E. J., & Hasan, T. (2016). Surfactant-aided exfoliation of molybdenum disulphide for ultrafast pulse generation through edge-state saturable absorption. Physica Status Solidi (B), 253 911-917. https://doi.org/10.1002/pssb.201552304
We use liquid phase exfoliation to produce dispersions of molybdenum disulphide (MoS2) nanoflakes in aqueous surfactant solutions. The chemical structures of the bile salt surfactants play a crucial role in the exfoliation and stabilization of MoS2. The resultant MoS2 dispersions are heavily enriched in single and few (<6) layer flakes with large edge to surface area ratio. We use the dispersions to fabricate free-standing polymer composite wideband saturable absorbers to develop mode-locked and Qswitched fibre lasers, tunable from 1535-1565 and 1030-1070 nm, respectively. We attribute this sub-bandgap optical absorption and its nonlinear saturation behaviour to edge-mediated states introduced within the material band-gap of the exfoliated MoS2 nanoflakes.
EJRK and TH acknowledge support from the Royal Academy of Engineering (RAEng).
External DOI: https://doi.org/10.1002/pssb.201552304
This record's URL: https://www.repository.cam.ac.uk/handle/1810/253012