How To Grow Monolayer Graphene With Specific Spatial Geometries

Graphene as thin as single atomic thickness is very hard and stable in air and owns good thermal and electrical conductivity. Since discovered in 2004 it caused widespread research interest, graphene is expected to develop a faster, thinner next-generation transistors and electronic components in order to replace the existing silicon-based materials. However, since there is no energy gap of graphene, for the production of optoelectronic components is difficult to directly, in order to overcome this drawback, the usual approach has doped graphene structure defect structure other atoms. A single wall carbon nano cone could be prepared by tailoring single atom sheets of graphene, and can survive for 101 years at room temperature. Theoretical study shows that the cone composed of only tens carbon atoms has electrical rectification effect, that could be used to prepared the diode. But it is still very hard to large-scale product.Considering the growth process of graphene sheets, we except that arbitrary nanostructure can form in the growth process if some geometry shapes are pre-curved on surface of the substrate on which graphene grows. The feasibility was proved by molecular simulations and time-going-backward quasi-dynamics. Specifically, if some pits of definite shapes in nanoscaleis pre-curved on the surfaces of Ni or Cu crystal, then the graphene sheets grown on these surfaces will take on similar geometrical structure as long as the structure size is not smaller than 0.8 nanometers.