According to my TGA data, I used the air atmosphere to calcine my material at 305 ° C (the reaction precursor is mainly the weight of graphene and ammonium metavanadate 150 mg, 900 mg). I took 0.2 g of the sample after the reaction and calcined 305 degrees for 2 hours, left about 0.18g . Does this mean that my graphene is completely removed?
If you have easy access to Raman Spectroscopy, try to confirm using this technique, if you still have some parts of graphene still in your sample, you'd be able to see.
Article Raman Spectroscopy in Graphene
try to use raman to get graphene raman characterstic peaks , if nothing appear , the probably its burnt
No necessarily means graphene is being burnt. Actually, at that temperature, I would expect more ammonium metavanadate to be decomposing. For example, the first possible reaction which comes to my mind is NH4+ -> NH3(g) + H+, i.e. formation of metavanadic acid.
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