Conversion of pristine and p-doped sulfuric-acid-treated single-walled carbon nanotubes to n-type materials by a facile hydrazine vapor exposure process

Pen Cheng Wang, Yu Chun Liao, Yu Ling Lai, Ying Chang Lin, Ching Yuan Su, Chuen Horng Tsai, Yao Jane Hsu

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

It was found in this study that a facile vapor-phase hydrazine (N 2H 4) treatment could effectively convert pristine and even p-doped sulfuric-acid-treated single-walled cabon nanotubes (SWCNTs) to n-type materials. The Raman spectroscopy results show that the facile vapor-phase hydrazine treatment could suppress the intensity of SWCNTs' radial breathing modes and alter SWCNTs' D-band vs. G-band intensity ratio. The sheet resistance measurement results show that the n-doping effect exerted by the vapor-phase hydrazine treatment could overwhelmingly counteract sulfuric acid's p-doping effect and subdue the SWCNTs' acquired p-type characteristics rendered by the sulfuric acid treatment. The ultraviolet photoelectron spectroscopy and X-ray photoelectron spectroscopy results suggest that certain reactive nitrogen-containing radicals thermally decomposed from hydrazine, such as nitrene and amidogen, could covalently functionalize CNTs and then n-dope the functionalzed CNTs.

Original languageEnglish
Pages (from-to)325-332
Number of pages8
JournalMaterials Chemistry and Physics
Volume134
Issue number1
DOIs
StatePublished - 15 May 2012

Keywords

  • Chemical techniques
  • Chemisorption
  • Electronic materials
  • X-ray photo-emission spectroscopy (XPS)

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