Exfoliated graphene oxide dispersion turns in to porous kind of material after freeze-drying. But if it is dried with rotary-evaporated and oven it is obtained as powder form. Does vacuum applied while freeze-drying affect nature of graphene oxide sheets?
Depends on the application that you need, you can choose any one of the drying process, however,for keeping functional groups and making the porous structure, freeze drying to five to six days is fine.
Dialysis followed by freeze drying in vacuum is better than hot-air drying..
Freeze drying is the preferred method. You will want to verify surface area by BET measurement after processing.
Freeze drying is better for preserving the diverse functional groups on GO. GO start to decompose at temperatures over 50 degree centigrade, as revealed by Siegfried Eigler in their paper 'Formation and Decomposition of CO2 Intercalated Graphene Oxide'.
https://www.researchgate.net/publication/241706801_Formation_and_Decomposition_of_CO2_Intercalated_Graphene_Oxide
If insist on using rotary evaporation, try temperatures below 50 degree centigrade for better structural integrity of GO.
Article Formation and Decomposition of CO2 Intercalated Graphene Oxide
how about drying reduced graphene oxide? is it freeze drying or hot air oven is suitable?
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