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Graphene-wrapped metal oxide nanocrystals, such as Fe2O3, Co3O4, and SnO2, with well-controlled size, shape, and density, are fabricated through a mechanism analogous to the colloidal coagulation effect at room temperature. A simple extension of this method yields Fe2O3/graphene composite, which is used for Li storage.
Wei et al. (2013) studied this question.