The pattern has too many peaks, maybe that at about 26° could be due to graphite but the others are strange. Could be they due to some residual of reagents? How do you perform the synthesis process?

GO was synthesised by using modified Hummer’s method. 54 ml sulphuric acid (H₂SO₄) in (9:1) ratio was mixed with 6 ml of phosphoric acid. 2 g of graphite powder was added to the solvent under constant stirring. After 5 minutes 12 g of potassium permanganate was gradually added at a rate of 1 g/ 5 min. Solution was kept for constant stirring for 1 day at room temperature ~ 20 °C until its colour turned from dark green to brown. After the stirring was stopped, 15 ml of hydrogen peroxide was added drop-wise. The addition of hydrogen peroxide initiated an exothermal process and changed the colour of the solution from brown to yellow. The solution was allowed to cool at room temperature before adding distilled water; it was then centrifuged at 4500 rpm for 30 minutes. It was washed with distilled water several times to remove excess of acids and then dried in oven at 80 °C for 8 hours.

Hi Abishek Lal,

Instead of using this (54 ml sulphuric acid (H₂SO₄) in (9:1) ratio was mixed with 6 ml of phosphoric acid) for washing. Use 54 ml sulphuric acid, 6 ml H2O2 and 140 ml distilled water than mix them and use this solution to wash it. This will result in formation of GO.

We haven't any peak in 10-12 degree to confirm the GO exist here.

If the sample was not fully oxidized, it may not exhibit the characteristic graphene oxide peak at 10-12 degrees 2θ.

I suggest you to further analysis and characterization techniques such as Raman spectroscopy, infrared spectroscopy, and elemental analysis may be necessary to confirm.