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dc.contributor.authorCOLEMAN, JONATHANen
dc.contributor.authorDONEGAN, JOHNen
dc.contributor.authorMCCLOSKEY, DAVIDen
dc.date.accessioned2016-09-16T11:06:42Z
dc.date.available2016-09-16T11:06:42Z
dc.date.created2016en
dc.date.issued2016en
dc.date.submitted2016en
dc.identifier.citationBackes C, Paton K.R, Hanlon D, Yuan S, Katsnelson M.I, Houston J, Smith R.J, McCloskey D, Donegan J.F, Coleman J.N, Spectroscopic metrics allow in situ measurement of mean size and thickness of liquid-exfoliated few-layer graphene nanosheets, Nanoscale, 8, 7, 2016, 4311 - 4323en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/77355
dc.descriptionPUBLISHEDen
dc.descriptionCited By :4 Export Date: 15 September 2016en
dc.description.abstractLiquid phase exfoliation is a powerful and scalable technique to produce defect-free mono- and few-layer graphene. However, samples are typically polydisperse and control over size and thickness is challenging. Notably, high throughput techniques to measure size and thickness are lacking. In this work, we have measured the extinction, absorption, scattering and Raman spectra for liquid phase exfoliated graphene nanosheets of various lateral sizes (90 ≤ 〈L〉 ≤ 810 nm) and thicknesses (2.7 ≤ 〈N〉 ≤ 10.4). We found all spectra to show well-defined dependences on nanosheet dimensions. Measurements of extinction and absorption spectra of nanosheet dispersions showed both peak position and spectral shape to vary with nanosheet thickness in a manner consistent with theoretical calculations. This allows the development of empirical metrics to extract the mean thickness of liquid dispersed nanosheets from an extinction (or absorption) spectrum. While the scattering spectra depended on nanosheet length, poor signal to noise ratios made the resultant length metric unreliable. By analyzing Raman spectra measured on graphene nanosheet networks, we found both the D/G intensity ratio and the width of the G-band to scale with mean nanosheet length allowing us to establish quantitative relationships. In addition, we elucidate the variation of 2D/G band intensities and 2D-band shape with the mean nanosheet thickness, allowing us to establish quantitative metrics for mean nanosheet thickness from Raman spectren
dc.description.sponsorshipThe research leading to these results has received funding from the European Union Seventh Framework Programme under grant agreement no 604391 Graphene Flagship. In addition, we acknowledge Science Foundation Ireland (11/PI/ 1087), the European Research Council (SEMANTICS and POC grant UP2DM) and Thomas Swan & Co. Ltd for financial support. CB acknowledges the German research foundation DFG (BA 4856/1-1). We thank Asbury Carbons and Imerys Graphite and Carbon for suppling parent graphite materials free of chen
dc.format.extent4311en
dc.format.extent4323en
dc.relation.ispartofseriesNanoscaleen
dc.relation.ispartofseries8en
dc.relation.ispartofseries7en
dc.rightsYen
dc.subjectnanosheet thicknessen
dc.subject.lcshnanosheet thicknessen
dc.titleSpectroscopic metrics allow in situ measurement of mean size and thickness of liquid-exfoliated few-layer graphene nanosheetsen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/colemajen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/dmcclosken
dc.identifier.peoplefinderurlhttp://people.tcd.ie/jdoneganen
dc.identifier.rssinternalid125592en
dc.identifier.doihttp://dx.doi.org/10.1039/c5nr08047aen
dc.rights.ecaccessrightsopenAccess
dc.identifier.rssurihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84958581226&partnerID=40&md5=cd6b5b67cdde09d0e677a3dcdf0354eben
dc.identifier.orcid_id0000-0001-9659-9721en


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