Figure 5.
SEM images of (a) ZnO NRAs, (b) ZnO/MnO2 NRAs, (c) ZnO/MnO2/PPy NRAs, (d) ZnO/MnO2/PPy/ MnO2 NRAs, and (e) MnO2/PPy/MnO2 TNTAs. (f) TEM image of MnO2/PPy/MnO2 TNTAs.
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