It was found that the probability in the formation of carbon materials without oxygen is almost nil due to the fact that the dangling bond itself tend to absorb the moisture quickly. Also, it is of special aim to optimize the ratio of carbon to oxygen to the particular limit so that the change of hydrophobic to hydrophilic nature can be executed without perturbing the desirable properties. Prior to realise the concept of functionalization, it is advisable to appreciate the term "doping". The term "doping" is basically interpreted as incorporation of trace quantity of impurities into the host substance to fine tune its properties. Whereas the term "functionalization" is basically a surface-related process which involves the connection of functional groups over the surface of host molecule . Hence the term oxygen functionalization is applicable for all the oxygen containing groups such as phenolic, carboxylic acid, alcoholic except cyclic ethers.