Stable and controlled amphoteric doping by encapsulation of organic molecules inside carbon nanotubes
Stable and controlled amphoteric doping by encapsulation of organic molecules inside carbon nanotubes
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DOI：
10.1038/nmat976
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发表时间：
2003-10-01
期刊：
影响因子：
41.2
通讯作者：
Iwasa, Y
中科院分区：
文献类型：
--
作者：
Takenobu, T;Takano, T;Iwasa, Y
单壁碳纳米管（SWNTs）由于其独特的结构和电子性质，在分子电子学方面具有很强的潜力。然而，在制造基于SWNT的器件之前，仍然需要解决各种悬而未决的问题。特别地，大规模的、空气稳定的和受控的掺杂是高度期望的。在这里，我们提出了一种将有机分子整合到单壁碳纳米管中的方法，有望推动这些材料的分子电子学性能极限。单壁碳纳米管与具有大的电子亲和能和小的电离能的分子的反应分别实现了p型和n型掺杂。光学特性表明，单壁碳纳米管和分子之间的电荷转移开始在一定的临界能量。X射线衍射实验表明，分子主要被封装在单壁碳纳米管内，从而提高了在空气中的稳定性。合成过程的简单性为大规模生产具有受控掺杂状态的单壁碳纳米管提供了可行的途径。
Single-walled carbon nanotubes (SWNTs) have strong potential for molecular electronics, owing to their unique structural and electronic properties. However, various outstanding issues still need to be resolved before SWNT-based devices can be made. In particular, large-scale, air-stable and controlled doping is highly desirable. Here we present a method for integrating organic molecules into SWNTs that promises to push the performance limit of these materials for molecular electronics. Reaction of SWNTs with molecules having large electron affinity and small ionization energy achieved p- and n-type doping, respectively. Optical characterization revealed that charge transfer between SWNTs and molecules starts at certain critical energies. X-ray diffraction experiments revealed that molecules are predominantly encapsulated inside SWNTs, resulting in an improved stability in air. The simplicity of the synthetic process offers a viable route for the large-scale production of SWNTs with controlled doping states.