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Ultraviolet–visible light (UV–vis) spectra of different composites: 5%Au@commercial ZnO–graphene (a); 10%Au@commercial ZnO–graphene (b); 5%Au@ZnO NPs–graphene (c); 10%Au@ZnO NPs–graphene (d); 5%Au@ZnO NWs–graphene (e); and 10%Au@ZnO NWs–graphene (f).
