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Micromorphology of synthesized nanoparticles: (a) graphene, (b) prism-like ZnO@graphene, (c) sheet-like ZnO@graphene, (d) rod-like ZnO@graphene [86]. Reproduced with permission from [Baijing Ren et al.], [Tribology International]; published by [Elsevier], 2020.
