Why does my synthesized graphene oxide turn black during oven drying at 50 degrees celcius?What does this mean?

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Sukanta Nandi

Graphene oxide turning black in general is an indication of reduction and thereby forming reduced graphene oxide.

You can check that whether reduced graphene oxide has been formed or not.

Lesia Mokoena

Thank you, How do I dry it while ensuring it does not get reduced to graphene oxide?

Just keep the GO dispersion in hot plate at 60 degree C under normal atmospheric condition.