Dear khaled

the best method for preparation of GO is improved hummer method. the product is high oxygen content , high yeild and lowest defect structural.

For graphene oxide preparation you need atleast 2 days. You can use modified Hummer's method. I am giving you the method.

"In a

typical procedure, 1 g natural graphite powder (XFNANO Materials Tech) was

dispersed in 25 mL concentrated sulfuric acid at room temperature and the mixture

was cooled down to 0uC in an ice bath. Subsequently, 3.5 g potassium permanganate

(Sinopharm Chemical Reagent) was slowly added, and a 2 h stirringwas conducted in

a 35uC water bath followed by adding 100 mL deionized water. Then, 8 mL hydrogen

peroxide solution (30 wt.% aqueous solution)was added until the color of the reaction

mixture turned to bright yellow. Dilute hydrochloric acid solution (10% by volume)

and deionized water were used to wash and remove the excess manganese salt and

acids in the product. The product powder was obtained from centrifugation

(8,000 r.m.p., 10 min) after repeating the washing process for four times. Finally, the

product GO powder was dried at 35uC under vacuum."

Dear khaled

the best method for preparation of GO is improved hummer method. the product is high oxygen content , high yeild and lowest defect structural.

Thank you very much ....

Dear Khaled, I myself used modified Hummers' method from this paper Chem. Mater.2010,22,1392–1401 and it worked.!

modified Hummers method is the best method to prepare GO. good luck.

What is most efficient method of preparation of reduced graphene oxide?

modified Hummers method is the best method to prepare GO.

Then you can reduce it using hydrazine hydrate or sodium borohydride ....