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Effect of gamma-irradiation on graphene obtained from different sources

AutorCastell, Pere; Hernández-Ferrer, Javier; Pascual, F. Javier; Alonso, Pablo J.; Benito, Ana M. ; Maser, Wolfgang K. ; Martínez Fernández de Landa, María Teresa; Puértolas, J. Antonio
Fecha de publicación2012
CitaciónGraphene Nanosciene: From Dirac Physics to Applications (2012)
ResumenThe effect of gamma irradiation on two different graphene materials was evaluated. The materials were obtained by two different strategies: the first method was based on the reduction of graphene oxide and the second method was based on the unzipping by chemical oxidation of multiwalled carbon nanotubes (MWCNTs) obtained by the arc discharge method. The materials obtained with these two strategies was afterwards gamma irradiated at different doses (60, 90 and 150 kGy) to evaluate their effect on the properties of graphene. The material was completely characterized by X-Ray Photoelectron Spectroscopy (XPS), Raman Spectroscopy The XPS data showed that the gamma irradiation reduced the oxygen content in both graphene materials, and the restoration of the sp2 structure was noticeable at the highest irradiation dosages. Raman spectroscopy indicated that the G band intensity increased in the irradiated samples due to a graphitization effect resulting from reorganization on the sp2 structure on the graphene surface previously observed in MWCNTs. The two different graphene based materials showed similar tendencies after gamma irradiation by XPS and Raman spectroscopy. Electron Spin Resonance (ESR) data were also carried out in all the studied material and further analysed.
DescripciónResumen del póster presentado a la conferencia: "Graphene Nanosciene: From Dirac Physics to Applications" celebrada en Granada (España) del 9 al 13 de septiembre de 2012.
URIhttp://hdl.handle.net/10261/121909
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