Hello.

I used Tour method and after adding H2O2, solution turn to yellow from dark brown. From the paper, it showed that oxidation of graphite flakes occur which mean Graphite Oxide form. Washing with 5% HCl and water then dilute with 400mL DI, stir and sonicate. The result characterized using FTIR and no C-OH, C-O-C, C-OH observed. Just one obvious peak (1635cm-1 attributes C=O) (most paper mentioned around 17++) was observed. Why it happened?

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