I am having very good experience of growing SLG graphene with very high quality. First time, I have observed very weird RAMAN spectra from my SLG graphene consisting a series of peak starting from 1210, 1250, 1305, 1348, 1390, 1430, 1450, 1525, 1590, and 1700. Does anyone observed such kind of things. Is it really from graphene or can be instrumentation problem or from atmosphere. Even 2D band is lower then G-Band. This happen first time otherwise it always two or three times in magnitude from all of my samples.
I am using 632nm red laser for excitation.
I think there is a problem with your sample as the spectra shows weird peaks corresponding to the absorption modes which are not expected to be present in Graphene. Also as you claim it to be a SGL, 2D peak should be very distinct and visible at least which is not. So in my opinion there is a serious flaw in ur sample.
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