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Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone

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posted on 2023-06-09, 09:09 authored by Sean OgilvieSean Ogilvie, Matthew LargeMatthew Large, Giuseppe Fratta, Manuela Meloni, Ruben Canton-Vitoria, Nikos Tagmatarchis, Florian Massuyeau, Christopher P Ewels, Alice KingAlice King, Alan DaltonAlan Dalton
N-methyl-2-pyrrolidone (NMP) has been shown to be the most effective solvent for liquid phase exfoliation and dispersion of a range of 2D materials including graphene, molybdenum disulphide (MoS2) and black phosphorus. However, NMP is also known to be susceptible to sonochemical degradation during exfoliation. We report that this degradation gives rise to strong visible photoluminescence of NMP. Sonochemical modifcation is shown to infuence exfoliation of layered materials in NMP and the optical absorbance of the solvent in the dispersion. The emerging optical properties of the degraded solvent present challenges for spectroscopy of nanomaterial dispersions; most notably the possibility of observing solvent photoluminescence in the spectra of 2D materials such as MoS2, highlighting the need for stable solvents and exfoliation processes to minimise the infuence of solvent degradation on the properties of liquid-exfoliated 2D materials.

Funding

Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and Communication; G1865; EUROPEAN UNION; 642742

History

Publication status

  • Published

File Version

  • Published version

Journal

Scientific Reports

ISSN

2045-2322

Publisher

Nature Publishing Group

Issue

a16706

Volume

7

Page range

1-7

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Materials Physics Group Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2017-12-04

First Open Access (FOA) Date

2017-12-04

First Compliant Deposit (FCD) Date

2017-12-02

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