PROBLEM TO BE SOLVED: To provide graphene sheets used in a technology avoiding an anxious effect of carbon nanotubes on the human body.;SOLUTION: The graphene sheets 10 are used for forming carbon tubes or the like, and each has a large size suppressing the intake into the human body. Each graphene sheet 10 has a distance between adjacent carbon atoms of 1.4 Å and a structure that six-membered ring carbons are flatly linked by SP2 hybridization, and is similar to the graphene sheet proposed for the carbon nanotube. Such graphene sheets 10 are obtained by peeling the layer structure of natural graphite.;COPYRIGHT: (C)2008,JPO&INPIT
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