Hey there! I am working on non-oxidative intercalation and expansion of graphite using sulfuric acid. I've investigated both electrochemical and liquid intercalation methods using 2*2 cm of graphite sheets (in each). Henceforth, I decided to switch over to graphite flakes. My concern spans over both the techniques.
1) I've observed that even though intercalation is visible (I can observe an increase in thickness of graphite sheets), no sufficient expansion takes place when I place the GIC in muffle furnace @ 700degC, even after prolonged periods of exposure. What could be the possible reason? Am I supposed to immediately transfer the graphite into the furnace after intercalation? Presently, I've waited for a day before expansion.
2) What size of graphite flakes should I start with, if I need to perform XRD later on the expanded graphite. Research papers suggest sizes from 30-320 um. What should be the optimal size?
Is your sulphuric acid just sulphuric acid or other impurities?! You may need to transfer immediately, and hopefully 200um will suffice.
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