Electrically driven cation exchange for in situ fabrication of individual nanostructures.
Electrically driven cation exchange for in situ fabrication of individual nanostructures.
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用于原位制造单个纳米结构的电驱动阳离子交换
DOI：
10.1038/ncomms14889
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发表时间：
2017-04-12
影响因子：
16.6
通讯作者：
Sun L
中科院分区：
文献类型：
--
作者：
Zhang Q;Yin K;Dong H;Zhou Y;Tan X;Yu K;Hu X;Xu T;Zhu C;Xia W;Xu F;Zheng H;Sun L
阳离子交换（CE）已被认为是合成异质纳米晶体的特别强大的工具。目前，毛细管电泳可分为两大类，即离子溶剂化驱动的毛细管电泳反应和热活化的毛细管电泳反应。在这里，我们报告了一个电驱动的CE反应，在透射电子显微镜内制备单独的纳米结构。在此过程中，Cd由于欧姆加热而被消除，而Cu+则在电场力的驱动下迁移到晶体中。对比实验表明，电驱动CE的可行性取决于初始和最终相之间的硫亚晶格的结构相似性，以及活性电极的标准电极电位。我们的实验结果表明，个别纳米晶体的选择性生长的策略，并提供至关重要的见解理解的微观途径，导致异质结构的形成。传统上由离子溶剂化或热活化驱动的阳离子交换是用于制备异质纳米结构的稳健方法，但对于制备单个纳米晶体缺乏选择性。在这里，作者报告了一种电驱动的阳离子交换反应，使他们能够以高选择性制造单个纳米晶体。
Cation exchange (CE) has been recognized as a particularly powerful tool for the synthesis of heterogeneous nanocrystals. At present, CE can be divided into two categories, namely ion solvation-driven CE reaction and thermally activated CE reaction. Here we report an electrically driven CE reaction to prepare individual nanostructures inside a transmission electron microscope. During the process, Cd is eliminated due to Ohmic heating, whereas Cu+ migrates into the crystal driven by the electrical field force. Contrast experiments reveal that the feasibility of electrically driven CE is determined by the structural similarity of the sulfur sublattices between the initial and final phases, and the standard electrode potentials of the active electrodes. Our experimental results demonstrate a strategy for the selective growth of individual nanocrystals and provide crucial insights into understanding of the microscopic pathways leading to the formation of heterogeneous structures. Cation exchange, traditionally driven by ion solvation or thermal activation, is a robust approach for preparing heterogeneous nanostructures but lacks selectivity for preparation of individual nanocrystals. Here, the authors report an electrically driven cation exchange reaction that enables them to fabricate individual nanocrystals with high selectivity.