Ultralong Natural Graphene Nanoribbons and Their Electrical Conductivity

An atomic force microscopy topograph with a long and narrow (≈24 µm × 37 nm) graphene nanoribbon emerging from a graphite flake laying on a silicon oxide substrate is shown in the image. The sample is prepared by microcleavage using silicone stamps instead of cellophane tape. These nanoribbons present well-defined edges along the graphite crystallographic directions.