**4. Conclusions**

Graphene oxide is a monolayer of carbon atom decorated by oxygen functional group. Abundant and non-used biomass wastes are promising candidate for carbon source to fabricate graphene oxide due to their highly carbon content. Carbonization process is the key step to produce biomass carbon as precursor. Modified Hummer's method is a facile and simple chemical wet process that can be served to synthesis graphene oxide form biomass waste. XRD pattern showed the Graphene Oxide had successfully produced from biomass waste. Graphene oxide plays important role in the advance science and technology today. GO can be applied as starting material to fabricate electrical and optical device such as cathode of battery and supercapacitor, transparent electrode, field effect device, electrical sensor, flexible electronics, photovoltaic device, electrochromic device, photocatalytic, and fuel cell. Numerous researches continuously report advance application of graphene oxide that depict advance graphene oxide-based technology in the future.
