Electronic properties and atomic structure of graphene nanoribbons
Event details
| Date | 24.10.2014 |
| Hour | 14:15 |
| Speaker | Antonio Tejada, Laboratoire de Physique des Solides, Université Paris-Sud et Synchrotron SOLEIL, France |
| Location | |
| Category | Conferences - Seminars |
Methods for producing graphene ribbons suffer from scalability problems, stringent lithographic demands and process-induced disorder in the graphene. For instance, in typical nanoribbons produced from lithographically patterned exfoliated graphene, charge carriers travel only about ten nanometers between scattering events, mainly because of edge disorder. It is however possible to take advantage of graphene grown on patterned SiC steps [1], where the edge is settled by growth instead by cutting an already existing graphene sheet. In this procedure, both armchair and zigzag graphene nanoribbons can in principle be tailored. We have observed by photoemission in the edge of armchair ribbons, a one-dimensional metallic– semiconducting–metallic region made entirely from graphene, with a gap opening greater than 0.5 eV in an otherwise continuous metallic graphene sheet [2]. In order to understand the origin of this gap in armchair ribbons, we have performed a detailed morphological characterization by STM and TEM. We have also demonstrated by STM that zigzag ribbons can also be obtained during the post-lithography growth [1]. On these zigzag graphene nanoribbons, transport measurements have shown that charge carriers travel at room temperature on a length scale greater than ten micrometers [3], which is similar to the performance of metallic carbon nanotubes, and opens a promising future for graphene electronics.
References:
[1] M. Sprinkle, M. Ruan, Y. Hu, J. Hankinson, M. Rubio-Roy, B. Zhang, X. Wu, C. Berger, and W.A. de Heer, Nature Nanotechnology 5, 727 (2010).
[2] J. Hicks, A. Tejeda, A. Taleb-Ibrahimi, M.S. Nevius, F. Wang, K. Shepperd, J. Palmer, F. Bertran, P. Le Fèvre, J. Kunc, W.A. de Heer, C. Berger, and E.H. Conrad, Nature Physics 9, 49 (2012).
[3] J. Baringhaus, M. Ruan, F. Edler, A. Tejeda, M. Sicot, A. Taleb-Ibrahimi, A.-P. Li, Z. Jiang, E.H. Conrad, C. Berger, C. Tegenkamp, and W.A. de Heer, Nature 506, 349 (2014).
References:
[1] M. Sprinkle, M. Ruan, Y. Hu, J. Hankinson, M. Rubio-Roy, B. Zhang, X. Wu, C. Berger, and W.A. de Heer, Nature Nanotechnology 5, 727 (2010).
[2] J. Hicks, A. Tejeda, A. Taleb-Ibrahimi, M.S. Nevius, F. Wang, K. Shepperd, J. Palmer, F. Bertran, P. Le Fèvre, J. Kunc, W.A. de Heer, C. Berger, and E.H. Conrad, Nature Physics 9, 49 (2012).
[3] J. Baringhaus, M. Ruan, F. Edler, A. Tejeda, M. Sicot, A. Taleb-Ibrahimi, A.-P. Li, Z. Jiang, E.H. Conrad, C. Berger, C. Tegenkamp, and W.A. de Heer, Nature 506, 349 (2014).
Practical information
- Informed public
- Free
Organizer
- ICMP (Arnaud Magrez and Raphaël Butté)