What are the possible ways of subtracting substrate signal from epitaxial graphene. The SiC substrate signal dominates in Raman spectra making the Raman analysis difficult.
Dear M.F. Saleem
I recommend some ways for subtracting extra signals:
1- The first, you must measure the Raman spectrum of SiC and graphene on SiC in the same conditions( temperature, accumulation time, average, smoothing, etc), then you can subtract the graphene+SiC from SiC.
2- secondly, When you measure Raman Spectrum, you can increase the distance of the tip from the film. but I don't recommend this one because it is not the best.
3- You can recognize the SiC peaks from graphene and remove them manually by fityk or tablecurve 2D softwares.
4- Some researchers mention to SiC peaks in the article without subtracting.
But I think the first is scientific and always researchers use this way for subtracting the additional peaks.
Very good suggestions. This will definitely provide you some help.
The easiest way I would suggest not to remove it manually. The best would be to transfer Gr on different substrate such as 280 nm thick SiO2 to measure Raman independently. If your experimental focus do not allow you that then, just use maximum magnification lens (100x) and focus sharply on Gr only during Raman measurement. Or you can transfer many Gr layers on the same SiC substrate to increase Gr signal (if your experimental focus allow you that). And also use laser intensity as low as possible, long acquisition and accumulation time to reduce SiC scattering signals. Its okay with the scientific publication, if you don't remove SiC Raman peaks from Gr peaks, but you have to mark it for sure.
Good luck..
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