| AVS 58th Annual International Symposium and Exhibition | |
| Graphene and Related Materials Focus Topic | Tuesday Sessions |
| Session GR+EM-TuM |
| Session: | Graphene: Optical Properties, Optoelectonics and Photonics |
| Presenter: | Jan-Willem Weber, Eindhoven University of Technology, Netherlands |
| Authors: | J.W. Weber, Eindhoven University of Technology, Netherlands M.C.M. van de Sanden, Eindhoven University of Technology, Netherlands |
| Correspondent: | Click to Email |
The infrared optical conductance of chemical vapour deposited (CVD) graphene is determined from near normal incidence reflection and transmission Fourier transform infrared measurements in the spectral range of 370-7000 cm-1. The real part of the conductance, up to 2500 cm-1 , shows both the effect from doping and finite temperature that was shown for exfoliated graphene.1,2 The conductance for the range 2500-7000 cm-1 is increasing from the value for the universal optical conductance (πe2/2h) to 1.5 times this value. This could imply that graphene and bilayer graphene have grown in a 1:1 ratio. The graphene is grown via CVD of methane and hydrogen on Cu-foil and transferred to a glass substrate following the procedure of Li et al.3 A three-phase optical model (air/graphene/glass) is used to simultaneously fit the reflection and transmission data and extract the (Kramers-Kronig consistent) optical conductance. The conductance will be used to compare it with the conductance of CVD-graphene that is exposed to a hydrogen plasma.
1Mak et al. Phys. Rev. Lett 101, 196405 (2008)
2Li et al. Nat. Phys. 4, 532 (2008)
3Li et al. Science 324, 1312 (2009)