Electron-stimulated defect formation in single-walled carbon nanotubes studied by hydrogen thermal desorption spectroscopy

Satoshi Arima, Sangkil Lee, Yutaka Mera, Shohei Ogura, Katsuyuki Fukutani, Yoshinori Sato, Kazuyuki Tohji, Koji Maeda

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Defects in single-walled carbon nanotubes introduced by low-energy electron irradiation at 8 K were sensitively detected by cryogenic thermal desorption of hydrogen molecules H 2 in the temperature range of 10-40 K. The thermal desorption spectrum was found to change significantly with sample annealing at temperatures as low as 40-70 K. Experimental results suggest that the H 2 physisorption sites responsible for the 'defect' peak at 28 K are interstitial channel space between nanotubes closely packed in bundles which becomes more easily accessible on damage. It is also suggested that the disordering provides groove sites for H 2 physisorption with smaller binding energy causing the damage-induced spectral component around 16 K, slightly lower than the desorption peak at 20 K that is observed in undamaged samples. The spectral change at 40-70 K could be interpreted by migration of adatoms at the low temperatures.

Original languageEnglish
Pages (from-to)1196-1199
Number of pages4
JournalApplied Surface Science
Volume256
Issue number4
DOIs
Publication statusPublished - 2009 Nov 30

Keywords

  • Carbon nanotube
  • Defect
  • Electron irradiation
  • Electronic excitation
  • Hydrogen
  • Physisorption
  • Thermal desorption

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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