How can we avoid the restacking of graphene, without the use of composites or adding functional groups? I am asking for reduced graphene oxide prepared by a chemical method.
I've synthesized GO by chemical method, experienced the same problem and found that if we'll leave sample for several days without washing, it will re-stake due to presence of sulfur etc as I used sulfuric acid as cleaving agent. In the 2nd attempt I synthesized the sample and washed it by 1 M HCl de-ionized water soon after the synthesis using centrifuge and prepared pure GO. So I'll suggest you not to leave the sample after preparation and wash it as soon as possible. It may be helpful for you.
Hello if your majority is restacking try ionic liquids and start from graphite but as you know they are expensive
I've synthesized GO by chemical method, experienced the same problem and found that if we'll leave sample for several days without washing, it will re-stake due to presence of sulfur etc as I used sulfuric acid as cleaving agent. In the 2nd attempt I synthesized the sample and washed it by 1 M HCl de-ionized water soon after the synthesis using centrifuge and prepared pure GO. So I'll suggest you not to leave the sample after preparation and wash it as soon as possible. It may be helpful for you.
Polar solvents such as N-Methyl-2-pyrrolidone (NMP) are very effective at separating sheets of graphene from bulk graphite and maintaining their isolation to form a colloidal-like solution .
References: Hernandez, Y., Nicolosi, V., Lotya, M., Blighe, F. M., Sun, Z., De, S., … Coleman, J. N. (2008). High-yield production of graphene by liquid-phase exfoliation of graphite. Nature nanotechnology, 3(9), 563–8. doi:10.1038/nnano.2008.215
If you maintain the liquid state graphene, we can limit the stacking behaviour. if you want to get solid product , freeze drying or supercritical drying is the best.
@ Vineet kumar, High temperature treamtents highly improve the stacking probablity, Due to this draw back , freeze drying emerged into material science field. As you said expansion will happen but only along the sheet not between the sheets.If one need to get poorly stacked graphene sheet in solid state in cost effective manner, should do some composites to intercalate between the sheets and consequenc chemical reductions.
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