I am preparing Graphene by using modified hummers method... I have little confusion with colour...
You can't obtain graphene from modified Hummers method. Starting from natural graphite, by means of the modified Hummers method you can obtain, after exfoliation, graphene oxide (GO). GO can be reduced (thermically or chemically) in a product similar to graphene (but more defective) usually named as reduced-graphene oxide (rGO).
However, the color of graphene in powder or dispersed in a solvent is black. The same for rGO. The colour of GO, instead, depends from the oxidation and from the solvent in which it is dispersed. GO dispersed in water is brownish.
The color of GO is yellow to dark brown.Color depends on oxidation process,oxidation time and solvent in which it is disperse.Mehods of preparing GO are:Hummer method,Hummer modified method and Staudenmaier method .Methods of productiion rGO are as foolowing:
1-mechanical exfoliation of graphite
2-chemical vapor deposition
3-graphene production from sugars
4-graphene production of coal
Thank you all and Can you explain some one, about calculations of quantity of chemicals ( in grams or mL) used in synthesis of Graphene oxide....
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