Synthesis of double-walled carbon nanotubes by catalytic chemical vapor deposition and their field emission properties

Yang Doo Lee, Hyeon Jae Lee, Jong Hun Han, Jae Eun Yoo, Yun Hi Lee, Jai Kyeong Kim, Sahn Nahm, Byeongr Kwon Ju

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41 Citations (Scopus)


Double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic chemical vapor deposition using Fe-Mo/MgO as a catalyst at 1000 °C under the mixture of methane and hydrogen gas. The nanotubes were purified by acid but were not damaged. Thermogravimetric analysis revealed the purity of the tubes to be about 90%. The high-resolution transmission electron microscopy image showed that DWCNTs have inner tube diameters of 1.4-2.6 nm and outer tube diameters of 2.3-3.4 nm. We observed radial breathing modes in Raman spectra, which are related to the diameter of inner nanotubes. The purified DWCNTs were mixed with organic vehicles and glass frit, and then they were screen-printed on glass substrate coated with indium tin oxide. The field emission properties of the screen-printed DWCNT films were examined by varying the amount of glass frit ingredient within the DWCNT paste. The results showed that DWCNT emitters had good emission properties such as turn-on field of 1.33-1.78 V/μm and high brightness. When the applied anode voltage. was gradually increased, current density and brightness became saturated. We also observed DWCNTs adsorbed on the anode plate; they were DWCNTs peeled off from the cathode plate for field emission measurement.

Original languageEnglish
Pages (from-to)5310-5314
Number of pages5
JournalJournal of Physical Chemistry B
Issue number11
Publication statusPublished - 2006 Mar 23

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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