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High resolution images of (a) grapheme-glucose oxidase (GOx); (b) Nafion/graphene-GOx; (c) MWCNT-GOx and (d) Nafion/MWCNT-GOx modified glassy carbon substrates using a helium ion microscope from Carl Zeiss, Germany. The scale bars for (a)/(b) and (c)/(d) are 10 μm and 200 nm, respectively.
