Formation of pseudomorphic nanocages from Cu2O nanocrystals through anion exchange reactions
Formation of pseudomorphic nanocages from Cu2O nanocrystals through anion exchange reactions
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DOI：
10.1126/science.aad5520
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发表时间：
2016-03-18
期刊：
影响因子：
56.9
通讯作者：
Teranishi, Toshiharu
中科院分区：
文献类型：
--
作者：
Wu, Hsin-Lun;Sato, Ryota;Teranishi, Toshiharu
离子纳米晶体（NCs）的晶体结构通常通过反应温度来控制，根据它们的相图。研究表明，不同形状但晶体结构相同的离子NCs在环境条件下进行阴离子交换反应，得到了不同晶体体系的伪晶产物。Cu2O纳米碳纳米管的形状相关阴离子框架（表面阴离子亚晶格和堆叠模式）决定了CuxS纳米笼阴离子交换产物的晶体体系。这种方法使我们能够将以体为中心的立方晶格转换为面为中心的立方晶格或六边形紧密排列的晶格，从而形成晶体学上不寻常的多重孪生结构。随后的阳离子交换反应产生了CdS纳米笼，同时保留了多重孪晶结构。在常温条件下，该方法还获得了纤锌矿型ZnS等高温稳定相。
The crystal structure of ionic nanocrystals (NCs) is usually controlled through reaction temperature, according to their phase diagram. We show that when ionic NCs with different shapes, but identical crystal structures, were subjected to anion exchange reactions under ambient conditions, pseudomorphic products with different crystal systems were obtained. The shape-dependent anionic framework (surface anion sublattice and stacking pattern) of Cu2O NCs determined the crystal system of anion-exchanged products of CuxS nanocages. This method enabled us to convert a body-centered cubic lattice into either a face-centered cubic or a hexagonally close-packed lattice to form crystallographically unusual, multiply twinned structures. Subsequent cation exchange reactions produced CdS nanocages while preserving the multiply-twinned structures. A high-temperature stable phase such as wurtzite ZnS was also obtained with this method at ambient conditions.