Thin multi-walled carbon nanotubes synthesized by rapid thermal chemical vapor deposition and their field emission properties

Kyoung Yong Chun, Seung Jung, Hae Young Choi, Jong Uk Kim, Cheol Jin Lee

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Thin multi-walled carbon nanotubes (MWCNTs) were successfully synthesized by a rapid thermal chemical vapor deposition (RTCVD) method using a liquid catalyst. The growth of the thin MWCNTs was achieved by decomposition of C 2H 2 over Fe-Mo/MgO/citric acid directly at 700 °C for 30 min. Most thin MWCNTs, which had about 6~8 graphene layers, showed high purity (~90%) and good crystallinity. Moreover, they showed homogenous morphology and uniform diameters. The average outer diameter of the thin MWCNTs was about 8 nm. The uniform diameter and good homogeneity of thin MWCNTs were mainly attributed to prevention of catalyst agglomeration at high temperature due to a short reaction time, and the high purity of thin MWCNTs was caused by suppression of the residual CNT growth after finishing a reaction in RTCVD process. Field emission properties of the thin MWCNTs were measured in a vacuum chamber at a pressure of less than 2 ? 10 -7 Torr. The turn-on field was about 3.35 V/μ, at the emission current density of 0.1 μ?/cm2, and the emission current density was 2.5 mA/cm 2 at an applied field of 6.7 V//i,m. Particularly, the thin MWCNTs showed strong emission stability at emission current density of 0.8 mA/cm 2 for 20 h.

Original languageEnglish
Pages (from-to)2148-2154
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume9
Issue number3
DOIs
Publication statusPublished - 2009 Mar

Keywords

  • Carbon nanotube
  • Field emission
  • RTCVD
  • Thin MWCNTs

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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