BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Electronic properties and atomic structure of graphene nanoribbons
DTSTART:20141024T141500
DTSTAMP:20260509T235633Z
UID:b6f8b1afbb0b3a680b9b3f1505e1283bd9a3d02017e7e422e21ecfe1
CATEGORIES:Conferences - Seminars
DESCRIPTION:Antonio Tejada\, Laboratoire de Physique des Solides\, Univers
 ité Paris-Sud et Synchrotron SOLEIL\, France\nMethods for producing graph
 ene ribbons suffer from scalability problems\, stringent lithographic dema
 nds and process-induced disorder in the graphene. For instance\, in typica
 l nanoribbons produced from lithographically patterned exfoliated graphene
 \, charge carriers travel only about ten nanometers between scattering eve
 nts\, mainly because of edge disorder. It is however possible to take adva
 ntage of graphene grown on patterned SiC steps [1]\, where the edge is set
 tled by growth instead by cutting an already existing graphene sheet. In t
 his procedure\, both armchair and zigzag graphene nanoribbons can in princ
 iple be tailored. We have observed by photoemission in the edge of armchai
 r ribbons\, a one-dimensional metallic– semiconducting–metallic region
  made entirely from graphene\, with a gap opening greater than 0.5 eV in a
 n 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-lithograph
 y growth [1]. On these zigzag graphene nanoribbons\, transport measurement
 s have shown that charge carriers travel at room temperature on a length s
 cale greater than ten micrometers [3]\, which is similar to the performanc
 e of metallic carbon nanotubes\, and opens a promising future for graphene
  electronics.\nReferences:\n[1] M. Sprinkle\, M. Ruan\, Y. Hu\, J. Hankins
 on\, M. Rubio-Roy\, B. Zhang\, X. Wu\, C. Berger\, and W.A. de Heer\, Natu
 re Nanotechnology 5\, 727 (2010).\n[2] J. Hicks\, A. Tejeda\, A. Taleb-Ibr
 ahimi\, 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).\n[3] J. Baringhaus\, M. Ruan\, F. Edler\, A. Tejeda
 \, M. Sicot\, A. Taleb-Ibrahimi\, A.-P. Li\, Z. Jiang\, E.H. Conrad\, C. B
 erger\, C. Tegenkamp\, and W.A. de Heer\, Nature 506\, 349 (2014).
LOCATION:PH L1 503 (Aquarium) http://plan.epfl.ch/?room=PHL1503
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR