In-situ TEM investigation of MoS2 upon alkali metal intercalation
In-situ TEM investigation of MoS2 upon alkali metal intercalation
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MoS2 碱金属插层的原位 TEM 研究
DOI：
10.1007/s11426-017-9128-0
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Bai Xuedong
中科院分区：
文献类型：
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作者：
Huang Qianming;Wang Lifen;Xu Zhi;Wang Wenlong;Bai Xuedong
二维二硫化钼（MoS2）相变可以通过几种方法诱导，并且已经研究了几十年。20世纪70年代初，碱金属插入MoS2被证明是一种有效的相变方法，近年来由于MoS2在储能方面的应用而引起人们的新的兴趣。碱金属嵌入MoS2的研究已被各种技术所采用，其中原位透射电子显微镜（TEM）提供了独特的真实的时间分辨能力，在高空间分辨率的材料的结构演变。本文利用原位TEM技术研究了MoS2在锂和钠嵌入过程中的结构演变，沿着纳米片的转变和电子衍射花样的变化。插层过程伴随着以几种形式存在的超结构的出现。离子嵌入导致了MoS2从2H到1T的相变，并对相变的驱动机制进行了讨论。这项工作提供了一个更全面的了解离子嵌入诱导相变的二硫化钼。
Phase transition in two dimensional molybdenum disulfide (MoS2) can be induced by several methods and has been investigated for decades. Alkali metal insertion of MoS2had been proved an effective method to cause phase transition early in 1970s, and has been gaining renewed interest recently, due to the possible application of MoS2in energy storage. The alkali metal intercalation of MoS2has been studied by various techniques, among whichin-situtransmission electron microscopy (TEM) provides unique capability of real time resolving the structural evolution of the materials at high spatial resolutions. Here byin-situTEM technique we investigated the structural evolution of MoS2upon lithium and sodium intercalation, along with transformation of the nanosheet and variation of the electron diffraction patterns. The intercalation process is accompanied by emergence of superstructures, which exist in several forms. The ion intercalation results in phase transition of MoS2from 2H to 1T, and the driving mechanism of the phase transition are discussed. The work provides a more comprehensive understanding of ion intercalation induced phase transition of MoS2.