铂单原子链中特殊的原子键性质
Peculiar atomic bond nature in platinum monatomic chains
摘要：
金属原子链已经被报道通过轻微的机械刺激改变其电子或磁性。然而，由于缺乏关于键性质的信息，机械响应一直被掩盖。在这里，我们澄清键的性质，铂（Pt）单原子链，我们开发的原位透射电子显微镜方法。采用石英长伸谐振器测量刚度，精度达到亚N/m。在链的中间和在连接到底部的键刚度估计分别为25和23 N/m，这是高于散装对应。有趣的是，发现0.25 nm的键长被弹性拉伸到0.31 nm，对应于24%的应变。这种特殊的键性质可以用一个新的概念“弦张力”来解释。这项研究是一个里程碑，将显著改变我们对一维物质中原子键的看法。
英文摘要：
Metal atomic chains have been reported to change their electronic or magnetic properties by slight mechanical stimulus. However, the mechanical response has been veiled because of lack of information on the bond nature. Here, we clarify the bond nature in platinum (Pt) monatomic chains by our developed in-situ transmission electron microscope method. The stiffness is measured with sub N/m precision by quartz length-extension resonator. The bond stiffnesses at the middle of the chain and at the connecting to the base are estimated to be 25 and 23 N/m, respectively, which are higher than the bulk counterpart. Interestingly, the bond length of 0.25 nm is found to be elastically stretched to 0.31 nm, corresponding to 24% in strain. Such peculiar bond nature could be explained by a novel concept of "string tension". This study is a milestone that will significantly change the way we think about atomic bonds in one-dimensional substance.
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