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Ultralow-Temperature Hydrothermal Synthesis of Zn-Mn Spinel Nanocrystals: Its Defect Spinel of λ-MnO<sub>2</sub> Prepared by a Soft Chemical Method
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Ultralow-Temperature Hydrothermal Synthesis of Zn-Mn Spinel Nanocrystals: Its Defect Spinel of λ-MnO2 Prepared by a Soft Chemical Method
Posted:2016-03-18 16:59    Column:2013
L. Xue, Z.-S. Wu, C. Ge, X.-D. Zhang*,
Materials Chemistry and Physics 2013, 138 (1): 124-130. 
DOI: 10.1016/j.matchemphys.2012.11.029  [PDF]

Abstract
An ultralow-temperature hydrothermal strategy was for the first time reported to synthesize spinel-type zinc manganese oxide (ZnMn2O4) nanocrystals at 70°C. The synthetic parameters including hydrothermal temperature, zinc or manganese source, hydrothermal time, and NaOH concentration were systematically investigated. The structure and morphology characterization revealed that the resulting Zn–Mn spinels are tetragonal-phase, and have well-defined crystalline structure with the size of 10–20nm. Furthermore, a defect spinel of λ-MnO2 nanocrystal (10–20nm) was directly synthesized from ZnMn2O4 nanocrystal upon acid leaching. Finally, a redox mechanism for the formation of λ-MnO2was discussed.

Dalian Institute of Chemical Physics, CAS
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