[freedi27]

I understand graphene gives very strong G and 2D band because it's resonance Raman where the excitation energy matches the energy difference between two electronic levels.

As I learned that the problem with resonance Raman is stron fluorescence signal, I was wondering why this was not the case here.

could anyone explain? or do I have the concept wrong?
Thank you

[Corribus]

Fluorescence is a problem is the fluorescence signal is close to where the excitation source is. I'm not sure where the fluorescence of graphene is, or what wavelengths are usually used for excitation, but if these are very different for this particular experiment, then fluorescence won't be an issue.

Here is some more information about fluorescence and resonance Raman spectroscopy.

http://chemwiki.ucdavis.edu/Physical_Chemistry/Spectroscopy/Vibrational_Spectroscopy/Raman_Spectroscopy/Resonant_vs._Nonresonant_Raman_Spectroscopy