09 Jun How to differentiate Graphene
Explaining how Graphene is produced
Graphene was isolated by the scotch-tape method for the first time in the world in 2004. This method proved that graphene was not only a theory, but a reality.
The scotch-tape method is absolutely not transferable for an industrial production of graphene. But it was a stepping-stone, and several different production processes emerged since the first isolation of graphene.
Two different strategies can be applied:
Graphene produced from gases by Chemical Vapour Deposition (CVD)
Graphene produced from graphite by exfoliation (chemical, mechanical, oxidative)
These different production processes give various graphene forms.
We can segment the graphene family in 2 ways:
Thickness of the material
Graphene is limited to 10 layers, so less than 3nm thick. Nowadays, very few companies are able to produce such a graphene.
- SLG: Single Layer Graphene (1 Layer)
- FLG: Few Layer Graphene (2-5 Layers)
- MLG: MultiLayer Graphene (<10 Layers)
- GNP: Graphite NanoPlates (<250 Layers)
For such a 2D material, thickness is a critical parameter. The thinnest the material, the better the properties will be!
Purity of Graphene
Functional groups, even in low quantity, decrease the performance as anticorrosion agent or thermal and electrical conductor.
The degree of functionalization and the level of defects, depend strongly on the method of production!
When choosing graphene, you should be careful of the quality and scalability of the graphene. It all depends on the application and how you want to use graphene.
|CVD||1 Layer||> 99.99%||–|
|Chemical exfoliation*||2-8 Layers||> 99.95%||++|
|Mechanical exfoliation||2-249 Layers||> 99%||++|
|rGO||1-249 Layers||95% < rGO < 99%||++|
|GO||2-249 Layers||< 80%||++|