Chemically Derived, Ultrasmooth Graphene Nanoribbon Semiconductors
Xiaolin Li(Stanford University), Xinran Wang(Stanford University), Li Zhang(Stanford University), Sang‐Won Lee(Stanford University), Hongjie Dai(Stanford University)
Cited by 4,788
Abstract
We developed a chemical route to produce graphene nanoribbons (GNR) with width below 10 nanometers, as well as single ribbons with varying widths along their lengths or containing lattice-defined graphene junctions for potential molecular electronics. The GNRs were solution-phase-derived, stably suspended in solvents with noncovalent polymer functionalization, and exhibited ultrasmooth edges with possibly well-defined zigzag or armchair-edge structures. Electrical transport experiments showed that, unlike single-walled carbon nanotubes, all of the sub-10-nanometer GNRs produced were semiconductors and afforded graphene field effect transistors with on-off ratios of about 10(7) at room temperature.