Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2011-04-08
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
19 pages, 6 figures, accepted for publication in Nanotechnology (2011)
Scientific paper
We have fabricated suspended few layer (1-3 layers) graphene nanoribbon field effect transistors from unzipped multiwall carbon nanotubes. Electrical transport measurements show that current-annealing effectively removes the impurities on the suspended graphene nanoribbons, uncovering the intrinsic ambipolar transfer characteristic of graphene. Further increasing the annealing current creates a narrow constriction in the ribbon, leading to the formation of a large band-gap and subsequent high on/off ratio (which can exceed 104). Such fabricated devices are thermally and mechanically stable: repeated thermal cycling has little effect on their electrical properties. This work shows for the first time that ambipolar field effect characteristics and high on/off ratios at room temperature can be achieved in relatively wide graphene nanoribbon (15 nm ~50 nm) by controlled current annealing.
Agapito Luis A.
Cheng Mark Ming-Cheng
Kioussis Nicholas
Lin Ming-Wei
Ling Cheng
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