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Graphene based materials. Graphene is a basic unit from which other forms of various shapes (nanotubes, onions, etc.) are derived. Graphene oxide and reduced graphene oxide bear oxygen-containing groups such as carboxylic groups (–COOH), hydroxylic groups (–OH), and ether groups (–O–). Graphite consists of individual graphene sheets. Adapted from [33], MDPI, 2019.
