DoctorPurple
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graphene synthesis?
Hi guys! I'm very new to this forum (just singed up today) so plz go easy on me. I was wondering if anyone has attempted to synthesize graphene?
specifically exfoliation of graphite via sonication? I know of many ways it can be made at home but I haven't heard much about sonication. if you've
made any by some other method I'd still love to hear about that too.
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macckone
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adhesive tape/graphite method is classic and easy as hell.
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VSEPR_VOID
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There are some good videos on making graphene on youtube
Within cells interlinked
Within cells interlinked
Within cells interlinked
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WGTR
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Quote: Originally posted by DoctorPurple  | | Hi guys! I'm very new to this forum (just singed up today) so plz go easy on me. I was wondering if anyone has attempted to synthesize graphene?
specifically exfoliation of graphite via sonication? I know of many ways it can be made at home but I haven't heard much about sonication. if you've
made any by some other method I'd still love to hear about that too. |
Here are some opinions based on previous observation, but aren't by any means intended to be authoritative. It's been a few years since I played
with this stuff.
Sonication in dimethyl formamide works. I have a suspension of graphene in DMF that has remained stable for several years. It's a black liquid.
Graphite is the most stable arrangement of elemental carbon. Over a critical concentration, graphene suspended in a solvent will re-arrange to
graphite and precipitate out, leaving a lower stable concentration than could've been attained if a lower concentration was initially attempted. The
maximum concentration that can be initially attained depends on the exfoliating solvent and the size of the starting material. Over-sonicating can be
counterproductive, as it seems to fracture the graphene to smaller pieces that tend to re-arrange to graphite more easily.
It's possible to obtain very concentrated dispersions of graphene, at least for short periods of time, if a dilute dispersion of graphene is rapidly
filtered out of the solvent. The graphene stacks into a film, but doesn't have time to re-arrange to graphite. While the film is still wet, it can
be re-dispersed into a smaller quantity of solvent via very brief sonication.
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