Improved crystallinity of double-walled carbon nanotubes after a high-temperature thermal annealing and their enhanced field emission properties

Seung Il Jung, Sung Ho Jo, Hee Sung Moon, Jae Myung Kim, Dong Sik Zang, Cheol Jin Lee

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

High-purity double-walled carbon nanotubes (DWCNTs) were synthesized by catalytic decomposition of CH4 over Fe-Mo/MgO catalyst at 900 °C. After purification, the DWCNTs were annealed at 1300 °C in vacuum condition of 10-5 Torr. The DWCNTs before and after the high-temperature thermal annealing were characterized using scanning electron microscopy, high-resolution transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis. It was observed that the annealed DWCNTs had enhanced crystallinity and reduced defects. In addition, the DWCNTs showed better field emission performance after high-temperature thermal annealing. The annealed DWCNTs indicated the turn-on field of about 1.16 V/μm at 0.1 μA/cm2 and the threshold field of about 2.12 V/μm at 1.0 mA/cm2. Moreover, the annealed DWCNTs exhibited better emission stability compared with the nonannealed DWCNTs. Such a remarkable improvement of field emission performance was attributed to the enhanced crystallinity and reduced defects of the annealed DWCNTs.

Original languageEnglish
Pages (from-to)4175-4179
Number of pages5
JournalJournal of Physical Chemistry C
Volume111
Issue number11
DOIs
Publication statusPublished - 2007 Mar 22

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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