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Synthesis of nanocrystalline manganese oxide powders: Influence of hydrogen peroxide on particle characteristics

Published online by Cambridge University Press:  31 January 2011

Jooho Moon ,
Masanobu Awano ,
Hiroyoshi Takagi  and
Yoshinobu Fujishiro
Jooho Moon
Affiliation:
National Industrial Research Institute of Nagoya, Nagoya 462, Japan
Masanobu Awano
Affiliation:
National Industrial Research Institute of Nagoya, Nagoya 462, Japan
Hiroyoshi Takagi
Affiliation:
National Industrial Research Institute of Nagoya, Nagoya 462, Japan
Yoshinobu Fujishiro
Affiliation:
National Industrial Research Institute of Nagoya, Nagoya 462, Japan
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Abstract

Nanocrystalline manganese oxide powders have been prepared at 25 °C by precipitation from Mn(NO3)2 aqueous solution. The presence and addition sequence of H2O2 significantly influence particle characteristics of the resulting manganese oxides, including crystal structure, particle size and morphology, and surface area, depending upon molar ratio of H2O2 with respect to Mn. The precipitation from preoxidized manganese solution by H2O2 results in flakelike-shaped amorphous hydrous manganese oxide (MnO2xH2O). In the absence of H2O2, on the other hand, amorphous Mn(OH)2 is obtained, and a part of Mn(OH)2 subsequently transforms into crystalline Mn3O4 by oxidation in air. Relative population of amorphous Mn(OH)2 decreases by dissolution when post-treated with H2O2. At Mn:H2O2 = 1:4, the well-defined 16-nm-sized nanocrystalline Mn3O4 with homogenous particle morphology is prepared. The treatment with excess H2O2, however, destroys crystalline Mn3O4 and leads to further oxidation of the aqueous manganese species. Under these conditions, a mixture of needlelike Mn2O3 and cubelike Mn3O4, including amorphous MnO2xH2O, is obtained.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 12 , December 1999 , pp. 4594 - 4601
Copyright
Copyright © Materials Research Society 1999

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