Efficient Transfer Doping of Carbon Nanotube Forests by MoO3

Santiago Esconjauregui, Lorenzo D'Arsié, Yuzheng Guo, Junwei Yang, Hisashi Sugime, Sabina Caneva, Cinzia Cepek, John Robertson

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We dope nanotube forests using evaporated MoO3 and observe the forest resistivity to decrease by 2 orders of magnitude, reaching values as low as ∼5 × 10-5 Ωcm, thus approaching that of copper. Using in situ photoemission spectroscopy, we determine the minimum necessary MoO3 thickness to dope a forest and study the underlying doping mechanism. Homogenous coating and tube compaction emerge as key factors for decreasing the forest resistivity. When all nanotubes are fully coated with MoO3 and packed, conduction channels are created both inside the nanotubes and on the outside oxide layer. This is supported by density functional theory calculations, which show a shift of the Fermi energy of the nanotubes and the conversion of the oxide into a layer of metallic character. MoO3 doping removes the need for chirality control during nanotube growth and represents a step forward toward the use of forests in next-generation electronics and in power cables or conductive polymers.

Original languageEnglish
Pages (from-to)10422-10430
Number of pages9
JournalACS Nano
Volume9
Issue number10
DOIs
Publication statusPublished - 2015 Sep 16
Externally publishedYes

Keywords

  • carbon nanotubes
  • doping
  • forests
  • interconnects
  • MoO
  • resistivity

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

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  • Cite this

    Esconjauregui, S., D'Arsié, L., Guo, Y., Yang, J., Sugime, H., Caneva, S., Cepek, C., & Robertson, J. (2015). Efficient Transfer Doping of Carbon Nanotube Forests by MoO3 ACS Nano, 9(10), 10422-10430. https://doi.org/10.1021/acsnano.5b04644