What does a sharp Raman peak at 2450cm-1 mean for graphene film on copper foil?

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Khoi Quang Nguyen

Can you show the picture of Raman spectrum of your sample.

Doğukan Şenyıldız

This is the spectrum.

Sridhar Vadahanambi

Raman measured at what wave length ? Origin of 2450 peak in nano carbons is extensively discussed in this paper

dx.doi.org/10.1016/j.carbon.2004.11.044

@Sridhar Vadahanambi,

It was 532 nm laser. I will look into that paper, thank you,

@Aurelio Sanz Arranz,

Sorry for the very late update. Thank you for your answer, you were right. The peak was originating from environmental light. Even though our Raman had a light-cancelling cover, we actually had to turn off every single light in our lab to get rid of that extra peak.