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. 2015 Mar 11;5:8939. doi: 10.1038/srep08939

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(a) A low magnification SEM image of SnO₂-rGO film (Film-1.0) on the whole tube; (b)–(d) SEM images of Film-1.0, Film-0.5, and Film-4.0, respectively; (e) TEM image of Film-1.0; (e) TEM image of pure GO sheets.