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Table 1 Carbon content, grain size, Raman-intensity ratio, and charge-transfer resistance of the RGO/C/ZnO, C/ZnO, and RGO/ZnO

From: Reduced graphene oxide/carbon double-coated 3-D porous ZnO aggregates as high-performance Li-ion anode materials

Sample Carbon content (wt.%) Grain size (nm) Raman intensity ( I D / I G ) Charge-transfer resistance ( R ct ) (Ω cm 2 )
RGO/C/ZnO 18.9 31.6 ± 7.9 0.76 60.8 ± 0.6
C/ZnO 7.6 31.3 ± 7.8 0.72 273.3 ± 1.2
RGO/ZnO 14.6 45.7 ± 17.1 0.83 99.6 ± 1.0