| Autor: |
Qi ZJ; Department of Physics and Astronomy, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States., Rodríguez-Manzo JA, Botello-Méndez AR, Hong SJ, Stach EA, Park YW, Charlier JC, Drndić M, Johnson AT |
| Jazyk: |
angličtina |
| Zdroj: |
Nano letters [Nano Lett] 2014 Aug 13; Vol. 14 (8), pp. 4238-44. Date of Electronic Publication: 2014 Jun 30. |
| DOI: |
10.1021/nl501872x |
| Abstrakt: |
Graphene nanoribbons (GNRs) are promising candidates for next generation integrated circuit (IC) components; this fact motivates exploration of the relationship between crystallographic structure and transport of graphene patterned at IC-relevant length scales (<10 nm). We report on the controlled fabrication of pristine, freestanding GNRs with widths as small as 0.7 nm, paired with simultaneous lattice-resolution imaging and electrical transport characterization, all conducted within an aberration-corrected transmission electron microscope. Few-layer GNRs very frequently formed bonded-bilayers and were remarkably robust, sustaining currents in excess of 1.5 μA per carbon bond across a 5 atom-wide ribbon. We found that the intrinsic conductance of a sub-10 nm bonded bilayer GNR scaled with width as GBL(w) ≈ 3/4(e(2)/h)w, where w is the width in nanometers, while a monolayer GNR was roughly five times less conductive. Nanosculpted, crystalline monolayer GNRs exhibited armchair-terminated edges after current annealing, presenting a pathway for the controlled fabrication of semiconducting GNRs with known edge geometry. Finally, we report on simulations of quantum transport in GNRs that are in qualitative agreement with the observations. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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