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首页> 外文期刊>Advanced Functional Materials >Hydrothermal growth of manganese dioxide into three-dimensional hierarchical nanoarchitectures
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Hydrothermal growth of manganese dioxide into three-dimensional hierarchical nanoarchitectures

机译：二氧化锰的水热生长成三维分层纳米结构

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Novel three-dimensional (3D) hierarchical nanoarchitectures of epsilon-MnO2 have been synthesized by a simple chemical route without the addition of any surfactants or organic templates. The self-organized crystals consist of a major epsilon-MnO2 dipyramidal single crystal axis and six secondary branches, which are arrays of single-crystal epsilon-MnO2 nanobelts. The growth directions of the nanobelts are perpendicular to the central dipyramidal axis, which shows sixfold symmetry. The shape Of the epsilon-MnO2 assembly can be controlled by the reaction temperature. The morphology of epsilon-MnO2 changes from a six-branched star-like shape to a hexagonal dipyramidal morphology when the temperature is increased from 160 to 180 degrees C. A possible growth mechanism is proposed. The synthesized epsilon-MnO2 Shows both semiconducting and magnetic properties. These materials exhibit ferromagnetic behavior below 25 K and paramagnetic behavior above 25 K. The epsilon-MnO2 system may have potential applications in areas such as fabrication of nanoscale spintronic materials, catalysis, and sensors.
机译：ε-MnO2的新颖三维（3D）分层纳米结构已通过简单的化学路线合成，无需添加任何表面活性剂或有机模板。自组织晶体由一个主要的ε-MnO2双金字塔形单晶轴和六个次级分支组成，它们是单晶ε-MnO2纳米带阵列。纳米带的生长方向垂直于中央二锥体轴，显示出六重对称性。 ε-MnO2组装体的形状可以通过反应温度来控制。当温度从160摄氏度增加到180摄氏度时，ε-MnO2的形态从六支星状变为六边形二锥体形态。提出了一种可能的生长机理。合成的ε-MnO2同时显示出半导体和磁性。这些材料在25 K以下表现出铁磁行为，在25 K以上表现出顺磁行为。ε-MnO2系统在诸如纳米自旋电子材料的制造，催化和传感器等领域可能具有潜在的应用。

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