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Citation: WANG Fan, WANG Yan-Min, WEN Yan-Xuan, SU Hai-Feng, LI Bin. Structural and Morphological Transformation of MnO₂ Nanostructures from Mn₃O₄ Precursor[J]. Acta Physico-Chimica Sinica, ;2010, 26(02): 521-526. doi: 10.3866/PKU.WHXB20100209 shu

Structural and Morphological Transformation of MnO₂ Nanostructures from Mn₃O₄ Precursor

1.
School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China

Received Date: 12 August 2009
Available Online: 22 December 2009

Manganese oxides show huge structural flexibility and appear in various crystallographic polymorphs. Hence, morphological and phase control of desired manganese oxide nanostructures could enable their properties to be tuned with a greater versatility, and endow them with potential applications. Herein, we report a simple hydrothermal route for the synthesis of various MnO2 nanostructures using Mn3O4 powder as raw material. The obtained products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Results show that in H2SO4 solution, urchin-like γ-MnO2 nanostructures and single-crystal β-MnO2 nanorods are obtained at 80 and 180 ℃, respectively. In addition, MnOOH nanowires were obtained in a dilute acid solution. The influence of synthetic parameters including temperature, acidity, and reaction time are discussed. The γ-MnO2 intermediate might play an important role in the formation of nanorods. The evolution of phases and morphologies in the reaction process suggested the anisotropic crystal growth for the formation of nanostructures under acidic conditions.
- Nanostructure,
- Hydrothermal growth,
- Manganese oxide,
- MnO2 nanorod,
- MnOOH nanowire
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沈阳化工大学材料科学与工程学院沈阳 110142

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Structural and Morphological Transformation of MnO2 Nanostructures from Mn3O4 Precursor

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Structural and Morphological Transformation of MnO₂ Nanostructures from Mn₃O₄ Precursor