Nanoscale insight into the exfoliation mechanism of graphene with organic dyes: effect of charge, dipole and molecular structure (Articolo in rivista)

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  • Nanoscale insight into the exfoliation mechanism of graphene with organic dyes: effect of charge, dipole and molecular structure (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1039/c3nr00258f (literal)
Alternative label
  • Andrea Schlierf, Huafeng Yang, Elias Gebremedhn, Emanuele Treossi, Luca Ortolani, Liping Chen, Andrea Minoia, Vittorio Morandi, Paolo Samor?', Cinzia Casiraghi, David Beljonne, Vincenzo Palermo (2013)
    Nanoscale insight into the exfoliation mechanism of graphene with organic dyes: effect of charge, dipole and molecular structure
    in Nanoscale (Online); RSC Publishing, Cambridge (Regno Unito)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Andrea Schlierf, Huafeng Yang, Elias Gebremedhn, Emanuele Treossi, Luca Ortolani, Liping Chen, Andrea Minoia, Vittorio Morandi, Paolo Samor?', Cinzia Casiraghi, David Beljonne, Vincenzo Palermo (literal)
Pagina inizio
  • 4205 (literal)
Pagina fine
  • 4216 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url
  • http://pubs.rsc.org/en/content/articlelanding/2013/nr/c3nr00258f (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 5 (literal)
Rivista
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  • 12 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 10 (literal)
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  • Google Scholar (literal)
  • ISI Web of Science (WOS) (literal)
  • Scopu (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • ISOF - National Research Council, Bologna, Italy. E-mail: palermo@isof.cnr.it School of Chemistry and Photon Science Institute, Manchester University, UK Laboratory for Chemistry of Novel Materials, University of Mons, Mons, Belgium IMM - National Research Council, Bologna, Italy ISIS & icFRC, Universite' de Strasbourg & CNRS, Strasbourg, France (literal)
Titolo
  • Nanoscale insight into the exfoliation mechanism of graphene with organic dyes: effect of charge, dipole and molecular structure (literal)
Abstract
  • We study the mechanism of surface adsorption of organic dyes on graphene, and successive exfoliation in water of these dye-functionalized graphene sheets. A systematic, comparative study is performed on pyrenes functionalized with an increasing number of sulfonic groups. By combining experimental and modeling investigations, we find an unambiguous correlation between the graphene-dye interaction energy, the molecular structure and the amount of graphene flakes solubilized. The results obtained indicate that the molecular dipole is not important per se, but because it facilitates adsorption on graphene by a \"sliding\" mechanism of the molecule into the solvent layer, facilitating the lateral displacement of the water molecules collocated between the aromatic cores of the dye and graphene. While a large dipole and molecular asymmetry promote the adsorption of the molecule on graphene, the stability and pH response of the suspensions obtained depend on colloidal stabilization, with no significant influence of molecular charging and dipole. (literal)
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