Takenobu Taishi, Takano Takumi, Shiraishi Masashi, Murakami Yousuke, Ata Masafumi, Kataura Hiromichi, Achiba Yohji, Iwasa Yoshihiro
Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan.
Nat Mater. 2003 Oct;2(10):683-8. doi: 10.1038/nmat976. Epub 2003 Sep 7.
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.
单壁碳纳米管（SWNTs）因其独特的结构和电子特性，在分子电子学领域具有巨大潜力。然而，在制造基于SWNT的器件之前，仍有各种突出问题需要解决。特别是，大规模、空气稳定且可控的掺杂是非常必要的。在此，我们提出一种将有机分子整合到SWNTs中的方法，有望推动这些材料在分子电子学方面的性能极限。SWNTs与具有大电子亲和势和小电离能的分子反应，分别实现了p型和n型掺杂。光学表征表明，SWNTs与分子之间的电荷转移始于某些临界能量。X射线衍射实验表明，分子主要封装在SWNTs内部，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可控掺杂状态的SWNTs提供了一条可行途径。
