Sensing organophosphorus compounds with SWCNT films

Mika Sahlman, Mari Lundström, Dawid Janas*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Promising electrical properties of single-walled carbon nanotubes (SWCNTs) open a spectrum of applications for this material. As the SWCNT electronic characteristics respond well to the presence of various analytes, this makes them highly sensitive sensors. In this contribution, selected organophosphorus compounds were detected by studying their impact on the electronic properties of the nanocarbon network. The goal was to untangle the n-doping mechanism behind the beneficial effect of organic phosphine derivatives on the electrical conductivity of SWCNT networks. The high-est sensitivity was obtained in the case of the application of 1,6-Bis(diphenylphoshpino)hexane. Consequently, free-standing SWCNT films experienced a four-fold improvement to the electrical conductivity from 272 ± 21 to 1010 ± 44 S/cm and an order of magnitude increase in the power factor. This was ascribed to the beneficial action of electron-rich phenyl moieties linked with a long alkyl chain, making the dopant interact well with SWCNTs.

Original languageEnglish
Article number4915
Number of pages11
Issue number14
Publication statusPublished - 19 Jul 2021
MoE publication typeA1 Journal article-refereed


  • Doping
  • Phosphines
  • Single-walled carbon nanotubes


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