Can you comment on this spectrum and two emission peaks please?

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P. Pardha-Saradhi

It seems either your graphe oxide is biphasic (or even multiphasic as is evident from atleast one spectrum) or has some impurities. [However, some pigments like chlorophyll a or b do show emission spectra with two peaks]

Mahmoud Gomaa

thanks Dr P. Pardha-Saradhi

but are the spectrum correct ?

Roya Kabiri

I agree with Dr P. Pardha-Saradhi. likely your graphene oxide is multiphasic.