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Graphene is an allotrope of carbon which built from monolayer sp2-bonded carbon atoms as a honeycomb crystal lattice.Since graphene was reported in 2004 from University of Manchester K.S.Novoselov and A.K.Geim,it has been attracting increasing interest because of its unique physical properties,such as quantum Hall effect at room temperature,high mobility,high transmittance,low resistance and so on.