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Title of article :
Monitoring influence of chemical preparation procedure on the structure of graphene nanosheets
Author/Authors :
Chengbo Shi، نويسنده , , Lei Chen، نويسنده , , Zhiwei Xu، نويسنده , , Yanan Jiao، نويسنده , , Hongzhi Zhang & Yinglin Li، نويسنده , , Chunhong Wang، نويسنده , , Mingjing Shan، نويسنده , , Zhen Wang، نويسنده , , Qiwei Guo، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2012
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Abstract :
A comparison concerned about the three approaches (Hummersʹ method, improved method and Marcano–Tourʹs method, which all have been published and widely quoted in the field of producing graphene oxide) for the preparation of graphene oxide is discussed. The monitoring effect of preparation procedure is determined by investigating the influences of chemical reagents and reaction conditions on the structure of graphene nanosheets. The structure of graphene oxide and chemically reduced graphene is characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The exact mechanisms concerned about the effects of chemical reagents on the product structures are briefly described. The incorporation of H3PO4 and the addition of excessive H2SO4 and KMnO4 are proved to make a higher oxidation degree compared with the traditional methods. Ice in Marcano–Tourʹs method is also seen to be beneficial to the increase of the graphite oxide interlayer spacing. Surprisingly, the graphene, which is prepared by reducing the product of Marcano–Tourʹs method, shows less defects than the other two ones. In addition, the graphene oxide produced by improved method is found to confront with few difficulties during the reduction process.
Journal title :
Physica E Low-dimensional Systems and Nanostructures
Journal title :
Physica E Low-dimensional Systems and Nanostructures
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