Graphene attracted a great interest as a nextgeneration electronic material, due to its good conductivity and mobility. Ithas been regarded more advantageous than carbon nanotube (CNT) becauseelectronic properties are isotropic and homogeneous compared to CNT. Manycompanies are providing graphene samples to research fields and to industry byvarious method as chemical vapor deposition (CVD) or mechanical exfoliation.Here, both for research point-of-view and industrial point-of-view, definingand judging the number of layers of fabricated graphene is critical.Unfortunately, there are no commonly accepted standard so far, which prevents areliable production and further expansion of applications. There are number ofmethods which is used to define the number of graphene layers such as atomicforce microscopy(AFM), transmittance, and Raman scattering. Those methods arebeneficial in certain aspects, however, none of them gives a precise measure ofnumber of layer or is not applicable in industry. In this talk, standardizationactivity about evaluation method of layer number of graphene will be provided. 

Graphene attracted a great interest as a nextgeneration electronic material, due to its good conductivity and mobility. Ithas been regarded more advantageous than carbon nanotube (CNT) becauseelectronic properties are isotropic and homogeneous compared to CNT. Manycompanies are providing graphene samples to research fields and to industry byvarious method as chemical vapor deposition (CVD) or mechanical exfoliation.Here, both for research point-of-view and industrial point-of-view, definingand judging the number of layers of fabricated graphene is critical.Unfortunately, there are no commonly accepted standard so far, which prevents areliable production and further expansion of applications. There are number ofmethods which is used to define the number of graphene layers such as atomicforce microscopy(AFM), transmittance, and Raman scattering. Those methods arebeneficial in certain aspects, however, none of them gives a precise measure ofnumber of layer or is not applicable in industry. In this talk, standardizationactivity about evaluation method of layer number of graphene will be provided.