The influence of strong electron and hole doping on the Raman intensity of chemical vapor-deposition graphene.

Kalbac, Martin; Reina-Cecco, Alfonso; Farhat, Hootan; Kong, Jing; Kavan, Ladislav; Dresselhaus, Mildred S · ACS Nano · 2010

basic_science · Level V

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Abstract

Electrochemical charging has been applied to study the influence of doping on the intensity of the various Raman features observed in chemical vapor-deposition-grown graphene. Three different laser excitation energies have been used to probe the influence of the excitation energy on the behavior of both the G and G' modes regarding their dependence on doping. The intensities of both the G and G' modes exhibit a significant but different dependence on doping. While the intensity of the G' band monotonically decreases with increasing magnitude of the electrode potential (positive or negative), for the G band a more complex behavior has been found. The striking feature is an increase of the Raman intensity of the G mode at a high value of the positive electrode potential. Furthermore, the observed increase of the Raman intensity of the G mode is found to be a function of laser excitation energy.