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Photochemical and electrochemical reduction of graphene oxide thin films: tuning the nature of surface defects

dc.contributor.authorQuezada Renteria, Javier Alan
dc.contributor.authorRuiz Garcia, Cristina
dc.contributor.authorSauvage, Thierry
dc.contributor.authorCházaro Ruiz, Luis Felipe
dc.contributor.authorRangel Méndez, José René
dc.contributor.authorAnia, Conchi O.
dc.date.accessioned2021-04-26T19:14:10Z
dc.date.available2021-04-26T19:14:10Z
dc.date.issued2020
dc.identifier.citationPhys. Chem. Chem. Phys., 2020,22, 20732-20743
dc.identifier.urihttp://hdl.handle.net/11627/5596
dc.description.abstract"Individual and combined photo(electro)chemical reduction treatments of graphene oxide thin films have been performed to modulate the type of defects introduced into the graphene sheets during the reduction. These were characterized by X-ray photoelectron and Raman spectroscopies, nuclear reaction analysis and electrochemical methods. Illumination of the graphene oxide thin film electrodes with low irradiance simulated solar light provoked the photoassisted reduction of the material with negligible photothermal effects. The photoreduced graphene oxide displayed a fragmented sp2 network due to the formation of a high density of defects (carbon vacancies) and the selective removal of epoxides and hydroxyl groups. In contrast, the electrochemical reduction under mild polarization conditions favored the formation of sp3 defects over vacancies, with a preferential removal of carbonyl and carboxyl groups over hydroxyl/epoxides. Used in conjunction, mild photochemical and electrochemical treatments allowed the obtainment of reduced graphene oxides with varied reduction degrees (ca. C/O ratio ranging from 4.9 to 2.2), and surface defects. Furthermore, the electrochemical reduction prevented the formation of vacancies during the subsequent illumination step. In contrast, both types of defects were accumulated when the GO electrode was first exposed to illumination and then polarized."
dc.publisherRoyal Society of Chemistry
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectThermal reduction
dc.subjectSpectroscopic characterization
dc.subjectGraphite oxide
dc.subjectRaman spectrum
dc.subjectOxygn
dc.subjectDeoxygenation
dc.subjectDispersions
dc.subjectMechanisms
dc.subjectNanosheets
dc.subjectChemistry
dc.subject.classificationQUÍMICA FÍSICA
dc.titlePhotochemical and electrochemical reduction of graphene oxide thin films: tuning the nature of surface defects
dc.typearticle
dc.identifier.doihttps://doi.org/10.1039/D0CP02053B
dc.rights.accessAcceso Abierto


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Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internacional