Carbene-functionalized single-walled carbon nanotubes and their electrical properties

Chao Liu, Qing Zhang, Francesco Stellacci, Nicola Marzari, Lianxi Zheng, Zhaoyao Zhan

Research output: Contribution to journalArticlepeer-review

Abstract

Pure metallic single-walled carbon nanotubes (m-SWCNTs) are very desirable for many electrode and interconnecting applications. However, the lack of reliable processing techniques to sort m-SWCNTs from the as-synthesized SWCNT samples is an obstacle to these applications. The effects of carbene-based covalent functionalization on the electrical properties of an isolated m-SWCNT, a semiconducting (s)-SWCNT, and a mixture network of both m- and s-SWCNTs are reported. For the first time, a semiconducting-to-metallic SWCNT transition upon dichlorocarbene functionalization is observed. Interestingly, the transition is reversible upon thermal annealing under ambient conditions. The electrical properties of m-SWCNTs remain largely unaffected whereas the on-state conductivity of s-SWCNTs is greatly reduced by this process, in agreement with the relevant theoretical predictions. These findings could pave the way for fabricating large-scale SWCNT-based interconnects and electrodes in full-carbon integrated circuits. Dichlorocarbene groups covalently attach onto the sidewalls of isolated semiconducting single-walled carbon nanotubes (s-SWCNTs), metallic SWCNTs (m-SWNTs), and network SWCNTs. A reversible s- to m-SWCNT transition is observed by both Raman scattering and electrical measurements. The electrical properties of m-SWCNTs remain largely unaffected, whereas the on-state conductivity of s-SWCNTs is greatly reduced by this process, in agreement with theoretical predictions.

Original languageEnglish
Pages (from-to)1257-1263
Number of pages7
JournalSmall
Volume7
Issue number9
DOIs
Publication statusPublished - May 9 2011

Keywords

  • carbenes
  • carbon nanotubes
  • electrical properties
  • field-effect transistors
  • semiconductors

ASJC Scopus subject areas

  • Biomaterials
  • Engineering (miscellaneous)
  • Biotechnology
  • Medicine(all)

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