Electronic transport in monolayer graphene nanoribbons produced by chemical unzipping of carbon nanotubes

  • Sinitskii A
  • Fursina A
  • Kosynkin D
 et al. 
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We report on the structural and electrical properties of graphene
nanoribbons (GNRs) produced by the oxidative unzipping of carbon
nanotubes. GNRs were reduced by hydrazine at 95 °C and further annealed
in Ar/H2 at 900 °C; monolayer ribbons were selected for the fabrication
of electronic devices. GNR devices on Si/SiO2 substrates exhibit
an ambipolar electric field effect typical for graphene. The conductivity
of monolayer GNRs (~35 S/cm) and mobility of charge carriers (0.5–3
cm2/V s) are less than the conductivity and mobility of pristine
graphene, which could be explained by oxidative damage caused by
the harsh H2SO4/KMnO4 used to make GNRs. The resistance of GNR devices
increases by about three orders of magnitude upon cooling from 300
to 20 K. The resistance/temperature data is consistent with the variable
range hopping mechanism, which, along with the microscopy data, suggests
that the GNRs have a nonuniform structure.

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  • Alexander Sinitskii

  • Alexandra A. Fursina

  • Dmitry V. Kosynkin

  • Amanda L. Higginbotham

  • Douglas Natelson

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