Ballistic and quantum conductor carbon nanotubes: a reference experiment put to the test
Ballistic and quantum conductor carbon nanotubes: a reference experiment put to the test
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弹道和量子导体碳纳米管：用于测试的参考实验
DOI：
10.1103/physrevb.90.195431
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发表时间：
2014
影响因子：
3.7
通讯作者：
C. Colliex,
中科院分区：
文献类型：
--
作者：
M. Kobylko;M. Kociak;Y. Sato;Koki Urita;A. M. Bonnot;A. Kasumov;Y. Kasumov;K. Suenaga;C. Colliex,
我们已经进行了电传输实验上的个别碳纳米管（CNT）在原位的透射电子显微镜使用液体-金属接触法（LMC方法），其中包括浸入放置在顶端的金属尖端到一滴液体汞（Hg）的CNT。在文献中，这种方法大多采用非可视化（非原位），以显示不同种类的碳纳米管的弹道和量子电导特性。我们表明，一方面thein situLMC方法非常适合于与CNT建立低电阻接触，但另一方面，由theex situLMC方法测量的弹道和量子电导可能会给出误报，原因有三：（a）CNT可能通过与Hg接触而从尖端表面去除，（B）出现的Hg尖端表面纳米接触可能被误认为是量子导体CNT，以及（c）出现的Hg纳米现象可能被误认为是弹道导体CNT。这些发现对解释以前报道的作品有很强的影响。
We have performed electrical transport experiments on individual carbon nanotubes (CNTs)in situin a transmission electron microscope using the liquid-metal contact method (LMC method), which consists of immersing a CNT placed on the apex of a metallic tip into a drop of liquid mercury (Hg). In the literature, this method has been mostly employed without visualization (ex situ) to show the ballistic- and quantum-conductance properties of different kinds of CNTs. We show that on the one hand thein situLMC method is well suited to create low-resistance contacts with the CNTs but on the other hand the ballistic and quantum conductance measured by theex situLMC method is likely to give false positives for three reasons: (a) the CNTs are likely to be removed from the tip surface through contact with the Hg, (b) occurring Hg-tip surface nanocontacts are likely to be mistaken for quantum-conductor CNTs, and (c) occurring Hg nanomenisci are likely to be mistaken for ballistic-conductor CNTs. These findings have strong consequences for the interpretation of previously reported works.