Solid State Intercalation, Deintercalation, and Cation Exchange in Colloidal 2D Bi2Se3 and Bi2Te3 Nanocrystals
Solid State Intercalation, Deintercalation, and Cation Exchange in Colloidal 2D Bi2Se3 and Bi2Te3 Nanocrystals
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DOI：
10.1021/acs.chemmater.6b05440
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发表时间：
2017-02-14
影响因子：
8.6
通讯作者：
Manna, Liberato
中科院分区：
文献类型：
--
作者：
Buha, Joka;Manna, Liberato
在固体状态下，Cu在Bi2Se3和Bi2Te3胶体纳米晶体中嵌入和脱嵌。为此，纳米晶体沉积在固体衬底上，并在Cu源或Cu清除剂的存在下进行适度加热。固相实验结果与基于溶液的插层实验结果一致。在中等水平的固态插层中，Cu在Bi2Se3和Bi2Te3中形成超晶格结构，而较高的插层水平最终导致阳离子交换。在Bi2Se3中尤其如此，它在保持初始纳米晶体的二维形态的同时转变为Cu2-xSe。固体嵌入是可逆的，Cu也可以在加热时从Bi2Se3和Bi2Te3纳米晶体中脱嵌，并用于固体衬底上的其他反应。然而，插层和脱层的程度取决于插层剂和宿主纳米晶体对加热的反应。本文探讨的概念为未来发展新型固态储能纳米器件或可能的基于纳米器件提供了希望，这些器件的性质和/或功能可以通过固态CE和嵌入/脱嵌的组合进行可逆调制。
Intercalation and deintercalation of Cu into and from Bi2Se3 and Bi2Te3 colloidal nanocrystals is demonstrated in solid state. For this purpose, the nanocrystals are deposited on a solid substrate and subjected to moderate heating in the presence of a Cu source or a Cu scavenger. The results of the solid state experiments are consistent with those produced by solution-based intercalation. At moderate levels of solid state intercalation above about 10 at%, Cu forms superlattice structures in both Bi2Se3 and Bi2Te3, while higher intercalation levels ultimately lead to cation exchange. This is particularly the case in Bi2Se3 which transitions to Cu2-xSe while maintaining the two-dimensional morphology of the starting nanocrystals. The solid state intercalation is reversible, and Cu can also be deintercalated from the Bi2Se3 and Bi2Te3 nanocrystals upon heating and utilized in other reactions on the solid substrate. The extent of intercalation and deintercalation, however, depends on any interaction between the intercalant and host nanocrystals in response to heating. The concepts explored here hold promise for future development of novel solid state based energy storage nanodevices or possibly NC-based devices whose properties and/or function could be reversibly modulated through a combination of solid state CE and intercalation/deintercalation.