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To formulate soluble chemically reduced graphene oxide (RGO) in solvent media,certain functionalization of graphene plates by charges, small molecules, or polymers must be performed through either covalent or noncovalent chemistry because pristine graphene or RGO itself is not readily soluble in any solvent media due to its extremely high van der Waals interaction (or van der Waals force) between 2D graphene plates.