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Chemically Derived, Ultrasmooth Graphene Nanoribbon Semiconductors

Xiaolin Li, Xinran Wang, L. Zhang, Sangwon Lee, H. Dai
Published 2008 · Materials Science, Medicine

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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 107 at room temperature.
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We thank Graftech for providing the samples
Supporting Online Material www.sciencemag.org/cgi/content/full/1150878/DC1 Materials and Methods Figs. S1 to S7 References
Materials and methods are available on Science Online



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