Influence of a gold substrate on the optical properties of graphene Academic Article uri icon

abstract

  • Spectroscopic ellipsometry combined with measurements of electrical characteristics and Kelvin probe force microscopy have been employed to investigate the interaction between graphene and a gold substrate, and the consequent changes of graphene's complex refractive index on gold. A strong blue shift, as much as 350meV, of the prominent absorption peak (exciton-shifted M-point Van Hove singularity in the ultraviolet range) of graphene has been observed, with respect to the peak position for the sample on an insulating substrate where this peak was observed at about 4.55eV. The results show that an interaction between graphene and a gold substrate can be characterized through the change of graphene's optical properties. In addition, the effects that a water layer trapped between graphene and gold during the transfer process has on the charge transfer between graphene and the gold substrate have been investigated.

published proceedings

  • JOURNAL OF APPLIED PHYSICS

author list (cited authors)

  • Matkovic, A., Chhikara, M., Milicevic, M., Ralevic, U., Vasic, B., Jovanovic, D., ... Gajic, R. S.

citation count

  • 12

complete list of authors

  • Matkovic, Aleksandar||Chhikara, Manisha||Milicevic, Marijana||Ralevic, Uros||Vasic, Borislav||Jovanovic, Djordje||Belic, Milivoj R||Bratina, Gvido||Gajic, Rado S

publication date

  • January 2015