Atomic structure and dynamic behaviour of truly one-dimensional ionic chains inside carbon nanotubes
Atomic structure and dynamic behaviour of truly one-dimensional ionic chains inside carbon nanotubes
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DOI：
10.1038/nmat4069
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发表时间：
2014-11-01
期刊：
影响因子：
41.2
通讯作者：
Suenaga, Kazu
中科院分区：
文献类型：
--
作者：
Senga, Ryosuke;Komsa, Hannu-Pekka;Suenaga, Kazu
降维材料在基础科学和应用科学的各个领域都引起了人们的极大兴趣。只有极少数元素金属(Au、Ag)或碳在环境条件下表现出很短的寿命，才能实现真正的单原子厚度的一维(1D)晶体。在这里，我们成功地合成了稳定的一维离子晶体，其中两个化学元素，一个是阳离子，另一个是阴离子，在碳纳米管内交替排列。实验证实了一维晶格中不同原子的不同寻常的动力学行为，并表明原子与纳米管鞘之间存在实质性的相互作用。我们的理论研究表明，一维离子晶体具有不同于其体相对应物的光学性质，并且这种性质可以通过在链中引入原子缺陷来实现。
Materials with reduced dimensionality have attracted much interest in various fields of fundamental and applied science. True one-dimensional (1D) crystals with single-atom thickness have been realized only for few elemental metals (Au, Ag) or carbon, all of which showed very short lifetimes under ambient conditions. We demonstrate here a successful synthesis of stable 1D ionic crystals in which two chemical elements, one being a cation and the other an anion, align alternately inside carbon nanotubes. Unusual dynamical behaviours for different atoms in the 1D lattice are experimentally corroborated and suggest substantial interactions of the atoms with the nanotube sheath. Our theoretical studies indicate that the 1D ionic crystals have optical properties distinct from those of their bulk counterparts and that the properties can be engineered by introducing atomic defects into the chains.