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Manganese dioxide nanomaterials with “Koosh‐ball”‐like morphology (MnO2‐KBs) as well as worm‐like nanotubes (MnO2‐NWs) are obtained by employing Tween 20 as the reducing and structure‐directing agent, and KMnO4 as a MnO2 precursor. Whereas the MnO2‐KBs are interconnected through tubular extensions, the MnO2‐NWs are largely disconnected. Both MnO2‐KBs and MnO2‐NWs have large BET surface areas (>200...
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