Graphene is a thin, two-dimensional layer of carbon atoms arranged in a hexagonal lattice. It is the basic building-block of graphite. It can therefore be obtined via exfoliation of graphite - mechanically or chemically. Chemical approach comprise oxidation state of graphene - graphene oxide, which can be then reduced to graphene.
Recently the first ISO standard on graphene quality has been issued. It constitutes that graphene can be called two-dimensional crystals of graphite with the thickness up to 10 atomic
layers. While other flakes containing more than10 graphene layers are basically graphite.
Accordingly to the recent study (published by Adv. Mater. 2018, 1803784 (2018), most of the samples of market available graphene materials contained less than 10% of graphene and the rest was just graphite powder.
Using graphene which does not corresponds to the standard will certainly lead to failed experiments, false research and costly production defects. Quality of the material directly affect its performance, and therefore it has to be assured in advance.
Using Grafren Technology we are able to purify as-synthesized Graphene Oxide paste and separate it into GO dispersion with true graphene content (99%) and waste (thick flakes and graphite powder).
Independently on the quality of incoming graphene material, GRAFREN technology allows up to 99% removal of graphite powder and thick flakes of the graphene.