Bandgap-selective chemical doping of semiconducting single-walled carbon nanotubes

Lain Jong Li*, R. J. Nicholas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Bandgap-selective p doping of single-walled carbon nanotubes (SWCNTs) in aqueous surfactant suspensions is reported. Nanotubes with narrower bandgaps are preferentially doped by hexacyanoferrate (III), as observed by optical absorption. The bandgap absorption characteristics, which are controlled by the chemical potential, can be reversibly adjusted by controlling the oxidation potential of the dopants through the pH value. The origin of the selective modification of bandgap absorption is electron transfer between the carbon nanotubes and the hexacyanoferrate (III), which preferentially depopulates the valence band in narrower gap nanotubes.

Original languageEnglish (US)
Pages (from-to)1844-1847
Number of pages4
Issue number12
StatePublished - Dec 2004
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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