■: Single-layer graphene■: Double-layer graphene■: Triple-layer graphene■: Quadruple-layer graphene Excitation wavelength 532 nm Obj. lens 100x (NA=0.90) Number of spectra 67,600 (400×169) Measurement time 5 min 30 sec Raman image of more than 60,000 spectra can be obtained in just 5 minutes The image above shows the Raman imaging of graphene on a heat oxidized silicon substrate. It takes only 5 minutes to identify and visualize the distribution of single-layer graphene which is one carbon atom sheet and double-layer, triple-layer and quadruple-layer graphene respectively. ■About the sample used for measurementThis sample is prepared by cleaving graphite with adhesive tape then transcribing it into silicon substrate. In this way, all graphene are formed on silicon substrate at…