Real-Time Imaging of Pt3Fe Nanorod Growth in Solution
Real-Time Imaging of Pt3Fe Nanorod Growth in Solution
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DOI：
10.1126/science.1219185
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发表时间：
2012-05-25
期刊：
影响因子：
56.9
通讯作者：
Zheng, Haimei
中科院分区：
文献类型：
--
作者：
Liao, Hong-Gang;Cui, Likun;Zheng, Haimei
纳米粒子附着法生长胶体纳米晶结构是传统单体附着法的替代方法。然而，纳米颗粒附着在显微镜下进行的机制仍不清楚。报道了Pt3Fe纳米棒从纳米颗粒构建块中溶液生长的实时透射电子显微镜成像。观察发现，通过形状定向的纳米颗粒附着，然后拉直、取向和形状校正，生长出缠绕的多晶纳米粒子链，从而产生单晶纳米棒。追踪纳米粒子的生长轨迹使我们能够区分单个纳米粒子和纳米粒子链施加的力场。这种对纳米粒子相互作用的量化和对生长路径的了解对于设计分级纳米材料和控制功能器件中的纳米晶体自组装具有重要意义。
The growth of colloidal nanocrystal architectures by nanoparticle attachment is frequently reported as an alternative to the conventional growth by monomer attachment. However, the mechanism whereby nanoparticle attachment proceeds microscopically remains unclear. We report real-time transmission electron microscopy (TEM) imaging of the solution growth of Pt3Fe nanorods from nanoparticle building blocks. Observations revealed growth of winding polycrystalline nanoparticle chains by shape-directed nanoparticle attachment followed by straightening and orientation and shape corrections to yield single-crystal nanorods. Tracking nanoparticle growth trajectories allowed us to distinguish the force fields exerted by single nanoparticles and nanoparticle chains. Such quantification of nanoparticle interaction and understanding the growth pathways are important for the design of hierarchical nanomaterials and controlling nanocrystal self-assembly for functional devices.