Abstract
A simple, inexpensive, low temperature and environmentally benign hydrothermal reduction route has been developed for the synthesis of octahedral Mn 3O 4 nanoparticles by using KMnO 4 and hexamethylenetetramine (HMT). It has been found that, Mn 3O 4 formation during hydrothermal process involves two steps. In the first step, an intermediate MnOOH is formed under the influence of self generated pressure in the autoclave. In the second step, formic acid produced via hydrolysis followed by oxidation of HMT, reduces MnOOH to Mn 3O 4. The powder X-ray diffraction (XRD) data confirms the formation of tetragonal γ-Mn 3O 4. Scanning electron micrograph images exhibit a good octahedral morphology of the product. The formation γ-Mn 3O 4 is further confirmed by Raman and FTIR spectroscopy.
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