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High-concentration shear-exfoliated colloidal dispersion of surfactant–polymer-stabilized few-layer graphene sheets

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Phiri, Josphat
dc.contributor.author Gane, Patrick
dc.contributor.author Maloney, Thaddeus
dc.date.accessioned 2019-05-06T09:03:14Z
dc.date.available 2019-05-06T09:03:14Z
dc.date.issued 2017-04-04
dc.identifier.citation Phiri , J , Gane , P & Maloney , T 2017 , ' High-concentration shear-exfoliated colloidal dispersion of surfactant–polymer-stabilized few-layer graphene sheets ' , Journal of Materials Science , vol. 52 , no. 13 , pp. 8321 . https://doi.org/10.1007/s10853-017-1049-y en
dc.identifier.issn 0022-2461
dc.identifier.issn 1573-4803
dc.identifier.other PURE UUID: 00a60452-7694-43f3-b2ab-7145bbd1e57d
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/00a60452-7694-43f3-b2ab-7145bbd1e57d
dc.identifier.other PURE LINK: http://link.springer.com/article/10.1007/s10853-017-1049-y/fulltext.html?wt_mc=alerts.TOCjournals
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/33020158/CHEM_Phiri_et_al_High_Concentration_Shear_2017_Jour_Mat_Science.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/37577
dc.description.abstract To exploit the remarkable properties of graphene fully, an efficient large-scale production method is required. Sonication-assisted liquid-phase exfoliation of graphite, for example, has been extensively used for the production of few-layer graphene sheets, but suffers from low efficiency and high energy consumption and thus is not viable for large-scale production. Here we demonstrate a method that is more efficient and has higher scalability potential than sonication. We show that a few-layer graphene at high concentration of up to 1.1 mg ml−1 can be achieved in aqueous-based medium by highly efficient shear exfoliation of graphite in a processing time of just 2 h. The exfoliation process was carried out in a commercially available high shear colloidal mixer fixed with a three-stage rotor–stator shear generator for optimum exfoliation with a continuous circulation system. The high efficiency and a significant improvement over sonication adopting our method were demonstrated by the fact that the conversion to few-layer graphene sheets produced after just 30 min by shear exfoliation required, in contrast, 100s of hours by sonication. High-concentration defect-free few-layer graphene in aqueous medium, produced at short shearing time, demonstrates that this method has high potential for large-scale production. The produced graphene films exhibit additionally a high electrical conductivity of about 29000 S m−1. en
dc.format.extent 8337
dc.format.extent 8321
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher SPRINGER
dc.relation.ispartofseries Journal of Materials Science en
dc.relation.ispartofseries Volume 52, issue 13 en
dc.rights openAccess en
dc.title High-concentration shear-exfoliated colloidal dispersion of surfactant–polymer-stabilized few-layer graphene sheets en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Bioproducts and Biosystems
dc.subject.keyword graphene
dc.subject.keyword graphite
dc.subject.keyword liquid phase exfoliation
dc.subject.keyword shear exfoliation
dc.identifier.urn URN:NBN:fi:aalto-201905062697
dc.identifier.doi 10.1007/s10853-017-1049-y
dc.type.version acceptedVersion
dc.date.embargo info:eu-repo/date/embargoEnd/2018-04-05

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