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

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      Author(s)
      Özcan, Şefika
      Vempati, Sesha
      Çırpan, A.
      Uyar, Tamer
      Date
      2018
      Source Title
      Physical Chemistry Chemical Physics
      Print ISSN
      1463-9076
      Publisher
      Royal Society of Chemistry
      Volume
      20
      Issue
      11
      Pages
      7559 - 7569
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We 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.
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      http://hdl.handle.net/11693/50033
      Published Version (Please cite this version)
      https://doi.org/10.1039/c7cp08334c
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      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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