In elemental analysis of graphene somebody reported the % of carbon 84%,oxygen 10% some people reported carbon > 90%. actually which one is the good composition for pure graphene.
graphene is 100% carbon, however, you can modulate the electrical properties with the degree of oxidation. Usually, when you increase the oxygen contents the electrical resistance increases. Also, when incorporating oxygen such as in GO you can modulate the band gap.
Yes absolutely caballero and Vineet. Once we are saying graphene means it is 100% carbon only but regarding C/O ratio it is always better to have more C/O ratio as it will directly govern the properties. Pertaining to the best composition it depends upon the target of use. if you need more condutivity then you need to have more sp2 bonded carbon atoms in the sheet rather than oxygen.