2024-03-28T15:08:14Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/49482022-12-20T11:50:11Zcom_10259_3844com_10259_5086com_10259_2604col_10259_3845
In-situ evidence of the redox-state dependence of photoluminescence in graphene quantum dots
Barrera, Joaquín
Ibáñez Martínez, David
Heras Vidaurre, Aránzazu
Ruiz Fernández, Virginia
Colina Santamaría, Álvaro
Química analítica
Chemistry, Analytic
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)
2018-09-12T11:41:39Z
2018-09-12T11:41:39Z
2017-01
info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
1948-7185
http://hdl.handle.net/10259/4948
10.1021/acs.jpclett.6b02694
eng
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
info:eu-repo/semantics/openAccess
application/pdf
American Chemical Society
https://riubu.ubu.es/bitstream/10259/4948/4/JPCLett2017_GOQDs.pdf.jpg
Hispana
TEXT
http://rightsstatements.org/vocab/CNE/1.0/
RIUBU. Repositorio Institucional de la Universidad de Burgos
http://hdl.handle.net/10259/4948