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首页> 外文期刊>Crystal growth & design >Twinning Driven Growth of Manganese Oxide Hollow Cones through Self-Assembly of Nanorods in Water
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Twinning Driven Growth of Manganese Oxide Hollow Cones through Self-Assembly of Nanorods in Water

机译：通过水中纳米棒的自组装孪生驱动锰氧化物空心锥的生长

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Hollow gamma-MnO2 nanocones are synthesized by precipitation in water at 95 degrees C through a "one-pot" procedure. Characterization of the particles is carried out using powder XRD, electron diffraction, FESEM, and TEM. The hexagonal-shaped base is shown to originate from specific {021} twinning. The growth mechanism is investigated and proposed to proceed through two steps. The first stage involves the growth of pyramidal seeds that direct the final shape of the particles. The second stage proceeds through oriented attachment of primary alpha-MnOOH nanorods on previously formed gamma-MnO2 cones. Attachment is accompanied by phase transformation of the oxyhydroxide to the oxide by a topotactic reaction, because of the structural relations between both structures. This study reports on the first demonstration of specific twinning from oriented attachment. This also provides a deep insight into the role of structural defects for further design of complex and novel architectures. Additionally, the procedure developed herein occurs in water without any surfactant. It is therefore low cost and environmentally friendly.
机译：空心的γ-MnO2纳米锥是通过“一锅法”在95℃的水中沉淀而合成的。使用粉末XRD，电子衍射，FESEM和TEM对颗粒进行表征。六角形的底基显示为源自特定的{021}孪晶。研究了生长机理，并提出了通过两个步骤进行的过程。第一阶段涉及金字塔状种子的生长，该种子指导粒子的最终形状。第二阶段通过将初级α-MnOOH纳米棒定向附着在先前形成的γ-MnO2锥上进行。由于两个结构之间的结构关系，伴随有通过羟基定向反应的羟基氧化物到氧化物的相变伴随。这项研究报告了定向附着的特定孪生的第一个证明。这也提供了对结构缺陷在进一步设计复杂和新颖的体系结构中的作用的深刻见解。另外，本文开发的方法在没有任何表面活性剂的水中进行。因此，它是低成本且环境友好的。

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