| Abstract: | Scanning tunnel microscopy(STM)is performed to verify if an Rh 'nails' structure is formed accompanying the graphene growing during chemical vapor deposition.A structure of a graphene island in an Rh vacancy island is used as the start.While the graphene island is removed by oxygenation,the variations of the Rh vacancy island are imaged with an in-situ high-temperature STM.By fitting with our model and calculations,we conclude that the best fit is obtained for 0%Rh,i.e.,for the complete absence of nails below graphene on Rh(111).That is,when graphene is formed on Rh(111),the substrate remains flat and does not develop a supporting nail structure. |
