▎ 摘　　要

Graphene nanoribbons are formed from ultrathin electrospun poly(methyl methacrylate) (PMMA) nanofibers by electron beam irradiation. The number and width of the graphene sheets can be controlled precisely (see figure), providing a novel method of obtaining designed graphenes. This graphitization technique could be combined with electron beam lithography in the future to obtain high-resolution patterned graphite circuits.