Associative behaviour and effect of functional groups on the fluorescence of graphene oxide

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buir.contributor.authorUyar, Tamer
buir.contributor.authorÖzcan, Şefika
buir.contributor.authorVempati, Sesha
buir.contributor.orcidUyar, Tamer|0000-0002-3989-4481
dc.citation.epage7569en_US
dc.citation.issueNumber11en_US
dc.citation.spage7559en_US
dc.citation.volumeNumber20en_US
dc.contributor.authorÖzcan, Şefikaen_US
dc.contributor.authorVempati, Seshaen_US
dc.contributor.authorÇırpan, A.en_US
dc.contributor.authorUyar, Tameren_US
dc.date.accessioned2019-02-21T16:02:41Z
dc.date.available2019-02-21T16:02:41Z
dc.date.issued2018en_US
dc.departmentNanotechnology Research Center (NANOTAM)en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractWe have juxtaposed the structural, vibrational and emission properties of graphene oxide (GO) with various degrees of reduction with and without a model dispersant, unveiling a strong associative behavior between GO sheets and the influence of H-bonds. The interlayer spacings are ∼0.84 and 0.78 nm for the as prepared and reduced samples. -OH groups are predominantly effected by the photo-thermal reduction. Also we note some regeneration of CO and -COOH groups in reduced samples. Clear changes to the phonon density of states indicated the doping effects due to H-bonds via the oxygeneous groups. Importantly, the defect related Raman bands are rather prone to the effect of dispersant, unveiling their intrinsic nature. In the context of fluorescence, internal vibration relaxation mediated by CC stretch vibrations emphasized the localized nature of sp2 domains of relatively smaller size. Fluorescence consists of 6 components, where the higher energy components are more influenced due to H-bonds than those of the lower energy regime, attributed to their associative behavior and chemical functionality, respectively. Excitation dependent fluorescence measurements indicated a range of optical gaps from ∼3.5 to 2 eV. The associative behavior of GO and rGO with and without a dispersant provides crucial insights into the fundamental understanding of various molecular processes.
dc.description.provenanceMade available in DSpace on 2019-02-21T16:02:41Z (GMT). No. of bitstreams: 1 Bilkent-research-paper.pdf: 222869 bytes, checksum: 842af2b9bd649e7f548593affdbafbb3 (MD5) Previous issue date: 2018en
dc.identifier.doi10.1039/c7cp08334c
dc.identifier.issn1463-9076
dc.identifier.urihttp://hdl.handle.net/11693/50033
dc.language.isoEnglish
dc.publisherRoyal Society of Chemistry
dc.relation.isversionofhttps://doi.org/10.1039/c7cp08334c
dc.source.titlePhysical Chemistry Chemical Physicsen_US
dc.titleAssociative behaviour and effect of functional groups on the fluorescence of graphene oxideen_US
dc.typeArticleen_US

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