how can wash graphene oxide and sonicate it that dont give Precipitate?
Hydrophilic GO sheets are approached via sufficient oxidation of graphite followed by exfoliation. Sonication is reliable dispersing tool that beak particles down to submicron and disperse, deagglomerate the particles using sonicator.Sufficient dispersion is mostly depends on mean lateral size of GO sheets,sonication time, solvent and GO concentration. On sonication, stable dispersion (for long time) of well-exfoliated undamaged , high-quality of fine and colloidal slurries of GO sheets is achieved .
You should note that precipitation from the dispersion can rely on multiple factors, such as how well oxidized your GO sample to concentration to (and very important) is your sample graphene oxide or graphitic oxide (i.e. single layer versus multiple layer).
You may want to check the following thread; possibly helpful: https://www.researchgate.net/post/What_are_the_factors_affecting_the_dispersion_of_graphene_in_water
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