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dc.contributor.authorBarrera, Joaquín 
dc.contributor.authorIbáñez Martínez, David 
dc.contributor.authorHeras Vidaurre, Aránzazu 
dc.contributor.authorRuiz Fernández, Virginia 
dc.contributor.authorColina Santamaría, Álvaro 
dc.date.accessioned2018-09-12T11:41:39Z
dc.date.available2018-09-12T11:41:39Z
dc.date.issued2017-01
dc.identifier.issn1948-7185
dc.identifier.urihttp://hdl.handle.net/10259/4948
dc.description.abstractChanges in the optical properties of graphene quantum dots (GQD) during electrochemical reduction and oxidation were investigated by photoluminescence (PL) spectroelectrochemistry, which provided direct in situ evidence of the dependence of GQD luminescence on their redox state. We demonstrated that GQD PL intensity was enhanced upon reduction (quantum yield increased from 0.44 to 0.55) and substantially bleached during oxidation (quantum yield ∼0.12). Moreover, PL emission blue/red-shifted upon GQD reduction/oxidation, rendering information about electronic transitions involved in the redox processes, namely, the π → π* and the n → π* transitions between energy levels of the aromatic sp2 domains and the functional groups, respectively. PL intensity changes during GQD reduction/oxidation resulted from a variation in structural changes in GQD as a result of charge injection, as corroborated by in situ Raman spectroelectrochemistry.en
dc.description.sponsorshipMinisterio de Economía y Competitividad (CTQ2014-55583-R, CTQ2014-61914-EXP, CTQ2015- 71955-REDT), Junta de Castilla y León (BU033-U16) and Basque Government under the ELKARTEK Program (ACTIMAT project, grant number KK-2015/00094 and KK-2016/ 00097)en
dc.format.mimetypeapplication/pdf
dc.language.isoenges
dc.publisherAmerican Chemical Societyen
dc.relation.ispartofThe Journal of Physical Chemistry Letters. 2017, V. 8, n. 2, p. 531–537
dc.subject.otherQuímica analíticaes
dc.subject.otherChemistry, Analyticen
dc.titleIn-situ evidence of the redox-state dependence of photoluminescence in graphene quantum dotsen
dc.typeinfo:eu-repo/semantics/article
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.relation.publisherversionhttps://doi.org/10.1021/acs.jpclett.6b02694
dc.identifier.doi10.1021/acs.jpclett.6b02694
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/CTQ2014-55583-R
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/CTQ2014-61914-EXP
dc.relation.projectIDinfo:eu-repo/grantAgreement/MINECO/CTQ2015-71955-REDT
dc.relation.projectIDinfo:eu-repo/grantAgreement/JCyL/BU033-U16
dc.relation.projectIDinfo:eu-repo/grantAgreement/GV/KK-2015-00094
dc.relation.projectIDinfo:eu-repo/grantAgreement/GV/KK-2016-00097
dc.type.hasVersioninfo:eu-repo/semantics/acceptedVersionen


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