Why the color of graphene oxide turns to violet after termination by H2O2?

I am using Improved Hummer method. Graphite: 1 gr KMnO4: 6gr H2SO4: 120ml H3PO4: 13 ml My mixture was on the stirrer for 12 hours (50 degree) and the color had turned to brown. I removed the...

07 June 2017 468 2 View