I am performing intercalation of graphite using 18M H2SO4. The compound obtained is unstable in air and therefore it must be analyzed at the earliest after it is prepared.
There is a chance to exfoliation during the XRD.
"unstable in moist air"... in dry conditions H2SO4 GIC shows better stability.. read this interesting paper on XRD of GIC... arXiv:1701.06493
Room temperature and low moisture should prevent H2SO4 from starting the reaction.
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