Cation exchange reactions-in ionic nanocrystals
Cation exchange reactions-in ionic nanocrystals
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DOI：
10.1126/science.1103755
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发表时间：
2004-11-05
期刊：
影响因子：
56.9
通讯作者：
Alivisatos, AP
中科院分区：
文献类型：
--
作者：
Son, DH;Hughes, SM;Alivisatos, AP
阳离子交换已经在不同组成、大小和形状的各种纳米晶体中被研究过。发生了完全和完全可逆的交换，反应的速度比大块阳离子交换过程快得多。确定了一个临界尺寸，在此尺寸以下，复杂纳米晶体的形状在交换反应中向能量最低的平衡形状演化。在临界尺寸以上，阴离子亚晶格保持不变，初始纳米晶的基本形状在整个阳离子交换过程中保持不变。与尺寸相关的形状变化也可以用来推断微观机制的特征。
Cation exchange has been investigated in a wide range of nanocrystals of varying composition, size, and shape. Complete and fully reversible exchange occurs, and the rates of the reactions are much faster than in bulk cation exchange processes. A critical size has been identified below which the shapes of complex nanocrystals evolve toward the equilibrium shape with lowest energy during the exchange reaction. Above the critical size, the anion sublattice remains intact and the basic shapes of the initial nanocrystals are retained throughout the cation exchange. The size-dependent shape change can also be used to infer features of the microscopic mechanism.