Room-temperature high on/off ratio in suspended graphene nanoribbon field-effect transistors

We have fabricated suspended few-layer (1-3 layers) graphene nanoribbon field-effect transistors from unzipped multi-wall carbon nanotubes. Electrical transport measurements show that current annealing effectively removes the impurities on the suspended graphene nanoribbons, uncovering the intrinsic...

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Published inNanotechnology Vol. 22; no. 26; p. 265201
Main Authors Lin, Ming-Wei, Ling, Cheng, Zhang, Yiyang, Yoon, Hyeun Joong, Cheng, Mark Ming-Cheng, Agapito, Luis A, Kioussis, Nicholas, Widjaja, Noppi, Zhou, Zhixian
Format Journal Article
LanguageEnglish
Published England IOP Publishing 01.07.2011
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Abstract We have fabricated suspended few-layer (1-3 layers) graphene nanoribbon field-effect transistors from unzipped multi-wall 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 bandgap and subsequent high on/off ratio (which can exceed 10(4)). 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 nanoribbons (15-50 nm) by controlled current annealing.
AbstractList We have fabricated suspended few-layer (1-3 layers) graphene nanoribbon field-effect transistors from unzipped multi-wall 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 bandgap and subsequent high on/off ratio (which can exceed 10(4)). 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 nanoribbons (15-50 nm) by controlled current annealing.
Author Zhang, Yiyang
Cheng, Mark Ming-Cheng
Zhou, Zhixian
Widjaja, Noppi
Agapito, Luis A
Kioussis, Nicholas
Lin, Ming-Wei
Ling, Cheng
Yoon, Hyeun Joong
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Title Room-temperature high on/off ratio in suspended graphene nanoribbon field-effect transistors
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