The role of twinning in shape evolution of anisotropic noble metal nanostructures
The role of twinning in shape evolution of anisotropic noble metal nanostructures
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DOI：
10.1039/b607128g
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发表时间：
2006-01-01
影响因子：
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通讯作者：
Jose Yacaman, Miguel
中科院分区：
文献类型：
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作者：
Luis Elechiguerra, Jose;Reyes-Gasga, Jose;Jose Yacaman, Miguel
纳米技术提供了通过控制材料的大小和形状来设计材料特性的能力。最有趣的纳米结构是各向异性的贵金属纳米晶体，如纳米棒和纳米线。然而，以可控的方式生产这种晶体仍然是一项具有挑战性的任务，许多可用的胶体技术产生了多种形态的混合物。在产生高产量的特定各向异性结构的情况下，生长机制主要是根据表面活性剂或盖层剂的存在来解释的，这些表面活性剂或盖层剂调节晶体在特定方向上的生长。然而，生长机理还应考虑成核和动力学，而不仅仅是表面稳定剂施加的热力学或物理限制。在这项工作中，我们提出了几个用不同方法获得的各向异性贵金属纳米晶体的例子。最后，讨论了孪生在决定最终形态习惯中的重要作用。
Nanotechnology provides the ability to engineer the properties of materials by controlling their size and shape. Among the most interesting nanostructures are anisotropic noble metal nanocrystals such as nanorods and nanowires. Nevertheless, the production of such crystals in a controlled fashion remains as a challenging task, and many available colloidal techniques produce a mixture of morphologies. In cases where high yields of a particular anisotropic structure have been produced, the growth mechanism has been primarily explained in terms of the presence of surfactants or capping agents that regulate the growth of the crystal in a particular direction. However, the growth mechanism should also consider nucleation and kinetics, and not only thermodynamics or physical restrictions imposed by the surface stabilizing agent. In this work, we present several examples of anisotropic noble metal nanocrystals obtained by different methods. Finally, the important role of twinning in determining the habit of the final morphology is discussed.