I know very well as the surface area of graphene behaves, but should take into account factors such as pretreatment temepratura: Very low can compromise the measurement surface contaminants. High if it can not cause decomposition of the material, in both cases the extent of surface area is less than the real.
You should also be careful when using BET when you have very high surface areas, since the presence of different pororos systems may hinder the use of the BET model, especially if you have the presence of micropores.
Greetings
Different types of graphene (i.e. single layer, few layer, multi-layer) manufactured by different processes (CVD vs. LPE vs. Oxidation/Reduction) will have different characteristics. Furthermore, graphene has a tendency to re-stack if not produced or handled correctly. While graphene has an very high theoretical surface area due to its nano geometry, in actuality, there are many other factors that contribute to the surface area.
If you are totally sure that your sample has been properly degassed, then you can use your result to calculate the restacking, i.e. the number of layers of your material. As the theoretical maximum is around 2600 m2/g for a complete exfoliation of graphite, then finding around 100 m2/g means that you have around 30 graphene layers superimposed. Therefore it is no more graphene, but rather graphite. Raman spectroscopy should let you know whether it is graphite or graphene.
Alain
From Raman, FTIR & XRD, I have confirmation that the product is Graphene. Thank you sir for your suggestion & discussion. Now I am trying to reduce it.
dear sir
i found same result for your work and that may be multi layer graphene or graphite
and that good not bad
you can improve your way to exflodation process by base
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