Abstract
A new MnOOH precursor route has been developed to synthesize single-crystalline nanorods of tetragonal β-MnO 2. Uniform γ-MnOOH nanorods were first prepared by reducing KMnO 4 with KI under hydrothermal conditions at 120 °C. After calcination of the γ-MnOOH nanorods at 250 °C for 2 h in air, β-MnO 2 nanorods retaining the morphologies of γ-MnOOH nanorods were obtained. The temperature, time and heating speed of calcination were found to be important for the morphologies of the β-MnO 2 nanorods.
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