Stable and controlled amphoteric doping by encapsulation of organic molecules inside carbon nanotubes

Taishi Takenobu*, Takumi Takano, Masashi Shiraishi, Yousuke Murakami, Masafumi Ata, Hiromichi Kataura, Yohji Achiba, Yoshihiro Iwasa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

503 Citations (Scopus)


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, resuming 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.

Original languageEnglish
Pages (from-to)683-688
Number of pages6
JournalNature Materials
Issue number10
Publication statusPublished - 2003 Oct
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)


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