APPLIED PHYSICS: Patterned Graphene Transport

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Science  01 Jun 2007:
Vol. 316, Issue 5829, pp. 1255c
DOI: 10.1126/science.316.5829.1255c

Graphene has received much recent attention, both experimental and theoretical, because of its mechanical stability and promising electronic properties. These single sheets of graphite, or unzipped carbon nanotubes, are expected to display many interesting transport properties that are dependent on geometry and crystallographic orientation, in much the same way in which the electronic properties of carbon nanotubes are dependent on their chirality, or how they are rolled up. Working with single sheets of graphene extracted from bulk graphite and patterned into strips of various widths (ranging from 10 to 100 nm) and a selection of crystallographic orientations, Han et al. have probed the ensuing transport properties. They found that the energy band gap widens with decreasing width, as expected from theory, but that there is no systematic variation with orientation. The results suggest a route to engineer the band gap of graphene nanostructures with potential applications for devices. ISO

Phys. Rev. Lett.98, 206805 (2007).

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