2026-04-28T21:06:37Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/49482022-12-20T11:50:11Zcom_10259_3844com_10259_5086com_10259_2604col_10259_3845

Barrera, Joaquín 51 600 Ibáñez Martínez, David 290 500 Heras Vidaurre, Aránzazu 273 500 0000-0002-5068-2164 Ruiz Fernández, Virginia 70e4e36c-40f1-4708-9fc9-83b1bef77e32 500 Colina Santamaría, Álvaro 122 500 0000-0003-0339-356X 2018-09-12T11:41:39Z 2018-09-12T11:41:39Z 2017-01 1948-7185 http://hdl.handle.net/10259/4948 10.1021/acs.jpclett.6b02694 Changes 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. Ministerio 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) application/pdf eng American Chemical Society The Journal of Physical Chemistry Letters. 2017, V. 8, n. 2, p. 531–537 https://doi.org/10.1021/acs.jpclett.6b02694 info:eu-repo/grantAgreement/MINECO/CTQ2014-55583-R info:eu-repo/grantAgreement/MINECO/CTQ2014-61914-EXP info:eu-repo/grantAgreement/MINECO/CTQ2015-71955-REDT info:eu-repo/grantAgreement/JCyL/BU033-U16 info:eu-repo/grantAgreement/GV/KK-2015-00094 info:eu-repo/grantAgreement/GV/KK-2016-00097 Química analítica Chemistry, Analytic In-situ evidence of the redox-state dependence of photoluminescence in graphene quantum dots info:eu-repo/semantics/article info:eu-repo/semantics/acceptedVersion info:eu-repo/semantics/openAccess THUMBNAIL JPCLett2017_GOQDs.pdf.jpg JPCLett2017_GOQDs.pdf.jpg IM Thumbnail image/jpeg 3809 https://riubu.ubu.es/bitstream/10259/4948/4/JPCLett2017_GOQDs.pdf.jpg 0f1b098872bfba3fc21987797e07bc6e MD5 4 ORIGINAL JPCLett2017_GOQDs.pdf JPCLett2017_GOQDs.pdf application/pdf 880713 https://riubu.ubu.es/bitstream/10259/4948/1/JPCLett2017_GOQDs.pdf b100d69d593aaa58715e2fd4007022dd MD5 1 LICENSE license.txt license.txt text/plain; charset=utf-8 999 https://riubu.ubu.es/bitstream/10259/4948/2/license.txt b295bcbce42e2caabeb0c623d3860c06 MD5 2 TEXT JPCLett2017_GOQDs.pdf.txt JPCLett2017_GOQDs.pdf.txt Extracted text text/plain 37693 https://riubu.ubu.es/bitstream/10259/4948/3/JPCLett2017_GOQDs.pdf.txt 30521dc4a0097ad06168a51ddded902b MD5 3 10259/4948 oai:riubu.ubu.es:10259/4948 2022-12-20 12:50:11.278 Repositorio Institucional de la Universidad de Burgos bubrep@ubu.es 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