The influence of edge structure on the electronic properties of graphene quantum dots and nanoribbons
| Autor: | Kyle Ritter, Joseph W. Lyding |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Condensed matter physics Band gap Graphene Mechanical Engineering Diamond Nanotechnology General Chemistry Electronic structure engineering.material Condensed Matter Physics law.invention Nanoelectronics Zigzag Mechanics of Materials Quantum dot law engineering General Materials Science Graphene nanoribbons |
| Zdroj: | Nature materials. 8(3) |
| ISSN: | 1476-4660 |
| Popis: | Graphene shows promise as a future material for nanoelectronics owing to its compatibility with industry-standard lithographic processing, electron mobilities up to 150 times greater than Si and a thermal conductivity twice that of diamond. The electronic structure of graphene nanoribbons (GNRs) and quantum dots (GQDs) has been predicted to depend sensitively on the crystallographic orientation of their edges; however, the influence of edge structure has not been verified experimentally. Here, we use tunnelling spectroscopy to show that the electronic structure of GNRs and GQDs with 2-20 nm lateral dimensions varies on the basis of the graphene edge lattice symmetry. Predominantly zigzag-edge GQDs with 7-8 nm average dimensions are metallic owing to the presence of zigzag edge states. GNRs with a higher fraction of zigzag edges exhibit a smaller energy gap than a predominantly armchair-edge ribbon of similar width, and the magnitudes of the measured GNR energy gaps agree with recent theoretical calculations. |
| Databáze: | OpenAIRE |
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