Tuning the grade of graphene: Gamma ray irradiation of free-standing graphene oxide films in gaseous phase

Dumée,LF, Feng,C, He,L, Allioux,F-M, Yi,Z, Gao,W, Banos,C, Davies,JB and Kong,L 2014, Tuning the grade of graphene: Gamma ray irradiation of free-standing graphene oxide films in gaseous phase, Applied Surface Science, vol. 322, pp. 126-135, doi: 10.1016/j.apsusc.2014.10.070.

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Title Tuning the grade of graphene: Gamma ray irradiation of free-standing graphene oxide films in gaseous phase
Author(s) Dumée,LFORCID iD for Dumée,LF orcid.org/0000-0002-0264-4024
Yi,ZORCID iD for Yi,Z orcid.org/0000-0001-8987-9514
Gao,WORCID iD for Gao,W orcid.org/0000-0002-7390-169X
Kong,LORCID iD for Kong,L orcid.org/0000-0001-6219-3897
Journal name Applied Surface Science
Volume number 322
Start page 126
End page 135
Total pages 10
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2014-12
ISSN 0169-4332
Keyword(s) bucky-papers
Gamma irradiation
Graphene oxide reduction and graphene
Radiation chemistry
Solution-free chemistry
Science & Technology
Physical Sciences
Chemistry, Physical
Materials Science, Coatings & Films
Physics, Applied
Physics, Condensed Matter
Materials Science
Graphene oxide reduction and graphene bucky-papers
Summary A direct approach to functionalize and reduce pre-shaped graphene oxide 3D architectures is demonstrated by gamma ray irradiation in gaseous phase under analytical grade air, N2 or H2. The formation of radicals upon gamma ray irradiation is shown to lead to surface functionalization of the graphene oxide sheets. The reduction degree of graphene oxide, which can be controlled through varying the γ-ray total dose irradiation, leads to the synthesis of highly crystalline and near defect-free graphene based materials. The crystalline structure of the graphene oxide and γ-ray reduced graphene oxide was investigated by x-ray diffraction and Raman spectroscopy. The results reveal no noticeable changes in the size of sp2 graphitic structures for the range of tested gases and total exposure doses suggesting that the irradiation in gaseous phase does not damage the graphene crystalline domains. As confirmed by X-ray photoemission spectroscopy, the C/O ratio of γ-ray reduced graphene oxide is increasing from 2.37 for graphene oxide to 6.25 upon irradiation in hydrogen gas. The removal of oxygen atoms with this reduction process in hydrogen results in a sharp 400 times increase of the electrical conductivity of γ-ray reduced graphene oxide from 0.05 S cm-1 to as high as 23 S cm-1. A significant increase of the contact angle of the γ-ray reduced graphene oxide bucky-papers and weakened oxygen rich groups characteristic peaks across the Fourier transform infrared spectra further illustrate the efficacy of the γ-ray reduction process. A mechanism correlating the interaction between hydrogen radicals formed upon γ-ray irradiation of hydrogen gas and the oxygen rich groups on the surface of the graphene oxide bucky-papers is proposed, in order to contribute to the synthesis of reduced graphene materials through solution-free chemistry routes.
Language eng
DOI 10.1016/j.apsusc.2014.10.070
Field of Research 090404 Membrane and Separation Technologies
Socio Economic Objective 960999 Land and Water Management of Environments not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2014, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30070185

Document type: Journal Article
Collections: Institute for Frontier Materials
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