Shaping binary metal nanocrystals through epitaxial seeded growth
Shaping binary metal nanocrystals through epitaxial seeded growth
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DOI：
10.1038/nmat1957
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发表时间：
2007-09-01
期刊：
影响因子：
41.2
通讯作者：
Yang, Peidong
中科院分区：
文献类型：
--
作者：
Habas, Susan E.;Lee, Hyunjoo;Yang, Peidong
纳米晶体的形态控制变得越来越重要，因为它们的许多物理和化学性质高度依赖于形状。然而，单材料和多材料系统的纳米晶体形状控制仍然是经验和具有挑战性的。需要探索新的方法来合理地合成设计具有可控形态的异质结构。例如，不同材料在良好刻面的晶种上的过度生长允许使用限定的晶种形态来控制二级结构的成核和生长。在这里，我们使用了高度刻面的立方体Pt种子来引导第二金属的外延过度生长。我们证明了这个概念与晶格匹配的Pd产生共形形状控制的核壳粒子，然后将其扩展到晶格失配的Au，给各向异性生长。用刻面纳米晶体播种可能对具有限定界面的形状控制的异质结构的发展具有显著的潜力。
Morphological control of nanocrystals has become increasingly important, as many of their physical and chemical properties are highly shape dependent. Nanocrystal shape control for both single- and multiple-material systems, however, remains empirical and challenging. New methods need to be explored for the rational synthetic design of heterostructures with controlled morphology. Overgrowth of a different material on well-faceted seeds, for example, allows for the use of the defined seed morphology to control nucleation and growth of the secondary structure. Here, we have used highly faceted cubic Pt seeds to direct the epitaxial overgrowth of a secondary metal. We demonstrate this concept with lattice-matched Pd to produce conformal shape-controlled core-shell particles, and then extend it to lattice-mismatched Au to give anisotropic growth. Seeding with faceted nanocrystals may have significant potential towards the development of shape-controlled heterostructures with defined interfaces.