Anisotropic Growth of One-Dimensional Silver Rod-Needle and Plate-Belt Heteronanostructures Induced by Twins and hcp Phase
Anisotropic Growth of One-Dimensional Silver Rod-Needle and Plate-Belt Heteronanostructures Induced by Twins and hcp Phase
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孪晶和 hcp 相诱导的一维银棒针和板带异质纳米结构的各向异性生长
DOI：
10.1021/ja903389s
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发表时间：
2009-08-12
影响因子：
15
通讯作者：
Li, Da Peng
中科院分区：
文献类型：
--
作者：
Shen, Xiao Shuang;Wang, Guan Zhong;Li, Da Peng
本文报道了一种在水溶液中一步高产率合成一维银杂多结构的方法。除了常见的银的面心立方结构外，异质结构还含有一种稀有的hcp(4H多型)相，这有利于不对称生长。棒针异质结构(RNHS)和板带异质结构(PBHS)是通过两种不同的机制形成的。对于RNHS，4H相和FCC相共存，但在不同的段中密度不同，对于PBHS，白色，FCC：和4H晶体结构分别存在于板段和带段中。条件敏感的共存相择优可以作为控制银纳米结构形状和性质的一种新方法。
In this paper, we report a one-step, high-yield synthesis of one-dimensional Ag heteronanostructures in aqueous solution. Besides the usual fcc: phase of Ag, the heteronanostructures also contain a rare hcp (4H polytypic) phase, which favors asymmetrical growth. The rod-needle heteronanostructures (RNHSs) and plate-belt heteronanostructures (PBHSs) are formed through two different mechanisms. For RNHSs, the 4H and fcc phases coexist but have different densities in different segments, white for PBHSs, the fcc: and 4H crystal structures exist in plate and belt segments, respectively. Condition-sensitive coexisting phase preferences can be applied as a new way of controlling the shape and thus the properties of Ag nanostructures.