Monodisperse manganese oxide nanoparticles: Synthesis, characterization, and chemical reactivity.

Highly monodisperse amorphous manganese oxide (MnO) nanospheres with diameter of ca. 300nm have been obtained from ammonia aqueous solution of KMnO at room temperature. The amorphous MnO nanospheres successfully converted to monodisperse K-OMS-2 (cryptomelane) and K-OMS-2/MnO nanoraspberries through calcination process at 600 and 800°C, respectively.