Fig. 4 Low magnification TEM images of N, S co-doped graphene (NSG) (a) and plasma-etched N, S co-doped graphene (P-NSG) (b); high magnification TEM images of NSG (c) and P-NSG (d); SAED patterns of NSG (e) and P-NSG (f); (g) schematic illustration of the synthesis process of P-NSG[44]
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