RT info:eu-repo/semantics/article
T1 In-situ evidence of the redox-state dependence of photoluminescence in graphene quantum dots
A1 Barrera, Joaquín
A1 Ibáñez Martínez, David
A1 Heras Vidaurre, Aránzazu
A1 Ruiz Fernández, Virginia
A1 Colina Santamaría, Álvaro
K1 Química analítica
K1 Chemistry, Analytic
AB 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.
PB American Chemical Society
SN 1948-7185
YR 2017
FD 2017-01
LK http://hdl.handle.net/10259/4948
UL http://hdl.handle.net/10259/4948
LA eng
NO Ministerio de Economía y Competitividad(CTQ2014-55583-R, CTQ2014-61914-EXP, CTQ2015-71955-REDT), Junta de Castilla y León (BU033-U16) andBasque Government under the ELKARTEK Program (ACTIMATproject, grant number KK-2015/00094 and KK-2016/00097)
DS Repositorio Institucional de la Universidad de Burgos
RD 24-nov-2024