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

Ogilvie, Sean P, Large, Matthew J, Fratta, Giuseppe, Meloni, Manuela, Canton-Vitoria, Ruben, Tagmatarchis, Nikos, Massuyeau, Florian, Ewels, Christopher P, King, Alice A and Dalton, Alan B (2017) Considerations for spectroscopy of liquid-exfoliated 2D materials: emerging photoluminescence of N-methyl-2-pyrrolidone. Scientific Reports, 7 (16706). ISSN 2045-2322

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Materials Physics Group
Subjects: Q Science
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Depositing User: Sean Paul Ogilvie
Date Deposited: 04 Dec 2017 08:50
Last Modified: 14 Dec 2017 10:40

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Project NameSussex Project NumberFunderFunder Ref
Enabling Excellence - Graphene based nanomaterials four touchscreen technologies: Comprehension, Commerce and CommunicationG1865EUROPEAN UNION642742