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Highly water dispersible functionalized graphene by thermal thiol-ene click chemistry

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dc.contributor.authorFarivar, F.
dc.contributor.authorYap, P.L.
dc.contributor.authorTung, T.T.
dc.contributor.authorLosic, D.
dc.date.issued2021
dc.description.abstractFunctionalization of pristine graphene to achieve high water dispersibility remains as a key obstacle owing to the high hydrophobicity and absence of reactive functional groups on the graphene surface. Herein, a green and simple modification approach to prepare highly dispersible functionalized graphene via thermal thiol-ene click reaction was successfully demonstrated on pristine graphene. Specific chemical functionalities (–COO, –NH2 and –S) on the thiol precursor (L-cysteine ethyl ester) were clicked directly on the sp2 carbon of graphene framework with grafting density of 1 unit L-cysteine per 113 carbon atoms on graphene. This functionalized graphene was confirmed with high atomic content of S (4.79 at % S) as well as the presence of C–S–C and N–H species on the L-cysteine functionalized graphene (FG-CYS). Raman spectroscopy evidently corroborated the modification of graphene to FG-CYS with an increased intensity ratio of D and G band, ID/IG ratio (0.3 to 0.7), full-width at half-maximum of G band, FWHM [G] (20.3 to 35.5) and FWHM [2D] (64.8 to 90.1). The use of ethanol as the reaction solvent instead of common organic solvents minimizes the chemical hazards exposure to humans and the environment. This direct attachment of multifunctional groups on the surface of pristine graphene is highly demanded for graphene ink formulations, coatings, adsorbents, sensors and supercapacitor applications.
dc.description.statementofresponsibilityFarzaneh Farivar, Pei Lay Yap, Tran Thanh Tung and Dusan Losic
dc.identifier.citationMaterials, 2021; 14(11):2830-1-2830-11
dc.identifier.doi10.3390/ma14112830
dc.identifier.issn1996-1944
dc.identifier.issn1996-1944
dc.identifier.orcidFarivar, F. [0000-0002-4829-1682]
dc.identifier.orcidYap, P.L. [0000-0001-7346-8139]
dc.identifier.orcidTung, T.T. [0000-0002-1535-5109]
dc.identifier.orcidLosic, D. [0000-0002-1930-072X]
dc.identifier.urihttp://hdl.handle.net/2440/131190
dc.language.isoen
dc.publisherMDPI
dc.relation.granthttp://purl.org/au-research/grants/arc/IH150100003
dc.rights© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
dc.source.urihttps://doi.org/10.3390/ma14112830
dc.subjectGraphene; functionalized graphene; thiol-ene click reaction; dispersible graphene
dc.titleHighly water dispersible functionalized graphene by thermal thiol-ene click chemistry
dc.typeJournal article
pubs.publication-statusPublished

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