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首页> 外文期刊>Crystal growth & design >Hierarchical-oriented attachment: From one-dimensional Cu(OH)(2) nanowires to two-dimensional CuO nanoleaves
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Hierarchical-oriented attachment: From one-dimensional Cu(OH)(2) nanowires to two-dimensional CuO nanoleaves

机译：分层定向附着：从一维Cu（OH）（2）纳米线到二维CuO纳米叶

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One-dimensional (1D) Cu(OH)(2) nanowires are converted into to two-dimensional (2D) CuO nanoleaves on a large scale, in which hierarchical-oriented attachment is involved. The whole transition process is captured and studied with the assistance of transmission electron microscopy (TEM) and high-resolution TEM images. Polycrystalline Cu(OH)(2) nanowires first evolved into single crystalline Cu(OH)(2) nanoleaves by an oriented attachment. In this process, Cu(OH)(2) nanoparticles (about 3 nm in diameter), which constructed the Cu(OH)(2) nanowires, rotated, oriented, and attached to produce single crystalline Cu(OH)(2) nanoleaves. Then, these single crystalline Cu(OH)(2) nanoleaves converted into single crystalline CuO nanoleaves via a reconstructive transformation, which consisted of the nucleation of CuO followed by a two-step oriented attachment of the CuO particles. In the formation of CuO nanoleaves, when the highest energy surfaces were eliminated by oriented attachment (from zero-dimensional nanoparticles to ID nanoribbons), the subordinate high-energy surfaces became the highest one, and the oriented attachment took place sequentially on these subordinate surfaces (from 1D nanoribbons to 2D nanoleaves). The attached particles with angles caused by the unfinished rotation of nanoparticles in the formation of single crystalline nanoleaves, which was supposed to be a necessary process for oriented attachment, were observed under the experimental conditions. This revealed the potentiality for the formation of 2D or three-dimensional nanostructures by hierarchical-oriented attachment. These findings may be helpful for understanding the nanocrystal growth process and the oriented attachment mechanism in depth.
机译：一维（1D）Cu（OH）（2）纳米线被大规模地转换为二维（2D）CuO纳米叶，其中涉及面向层次的连接。借助透射电子显微镜（TEM）和高分辨率TEM图像来捕获和研究整个过渡过程。多晶Cu（OH）（2）纳米线首先通过定向附着演化为单晶Cu（OH）（2）纳米叶。在此过程中，Cu（OH）（2）纳米粒子（直径约3 nm）构造了Cu（OH）（2）纳米线，旋转，定向并连接以生成单晶Cu（OH）（2）纳米叶。然后，这些单晶Cu（OH）（2）纳米叶通过重构转化转变为单晶CuO纳米叶，包括CuO的成核，然后是CuO颗粒的两步定向附着。在形成CuO纳米叶的过程中，当通过定向附着（从零维纳米粒子到ID纳米带）消除了最高能级的表面时，下级高能表面成为最高的表面，并且定向附着在这些下级表面上依次发生（从1D纳米带到2D纳米叶）。在实验条件下，观察到了由于单晶纳米叶形成过程中纳米颗粒未完成旋转而导致的具有一定角度的附着颗粒，这被认为是定向附着的必要过程。这揭示了通过分层定向附着形成2D或三维纳米结构的潜力。这些发现可能有助于深入了解纳米晶体的生长过程和定向的附着机理。

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