N-type doping effect of single-walled carbon nanotubes with aromatic amines

Raushan B. Koizhaiganova, Doo Hee Hwang, Cheol Jin Lee, Siegmar Roth, Urszula Dettlaff-Weglikowska

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We investigated the chemical doping of the single-walled carbon nanotubes (SWCNTs) networks by a treatment with aromatic amines. Adsorption and intercalation of amine molecules in bundled SWCNTs leads to typical n-type doping observed already for alkali metals. The electron donation to SWCNTs is demonstrated by the X-ray-induced photoelectron spectra (XPS), where the carbon C 1s peak observed at 284.4eV for the sp2 carbon in pristine samples is shifted by up to 0.3eV to higher binding energy upon chemical treatment. The development of a Breit-Wigner-Fano component on the lower energy side of the G- mode in the Raman spectrum as well as a shift of the G+ to lower frequency provide evidence for charge accumulation in the nanotube π system, and indication for the n-type doping. The spectroscopic changes are accompanied by the modification of the electrical properties of the SWCNTs. A reduction of conductivity depends on the doping level and implies the decreasing concentration of the charge carriers in the naturally p-doped tubes. Comparing the two selected n-type dopants, the tetramethyl-p-phenylenediamine, shows more pronounced changes in the XPS and the Raman spectra than tetramethylpyrazine, indicating that the sp3 hybridization of nitrogen in the amine groups attached to phenyl ring is much more effective in interaction with the tube π system than the sp2 hybridization of nitrogen in the aromatic pyrazine ring.

Original languageEnglish
Pages (from-to)2793-2796
Number of pages4
JournalPhysica Status Solidi (B) Basic Research
Volume247
Issue number11-12
DOIs
Publication statusPublished - 2010 Dec 1

Keywords

  • N-doping
  • Single-walled carbon nanotubes
  • TMPD
  • X-ray photoelectron spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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