Abstract
The preparation of trimanganese tetroxide (Mn 3O 4) nanocrystallites from γ-MnOOH nanowires under mild conditions has been achieved by two steps: first, γ-MnOOH nanowires with a mean diameter of about 12 nm and lengths of up to several micrometers were directly prepared via hydrothermal reaction between KMnO 4 and toluene in water at 180°C for 24 h; then, pure Mn 3O 4 nanocrystallites could be obtained by solvothermal treatment of the γ-MnOOH nanowires in ethylenediamine (EDA) and ethylene glycol (EG) at 150°C for 24 h. It was found that the Mn 3O 4 product obtained in EDA comprised well-defined nanocrystallites with the size in the range of 15–35 nm, while the one obtained in EG consisted of aggregated nanoparticles with the size of less than 18 nm.The possible formation mechanism of nanocrystalline Mn 3O 4 in EDA and EG and reasons for the different effects of various solvents on the products were also proposed.
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