Investigation of field emission and photoemission properties of high-purity single-walled carbon nanotubes synthesized by hydrogen Arc discharge

Byeongchul Ha, Jeunghee Park, Shin Young Kim, Cheol Jin Lee

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Single-walled carbon nanotubes (SWCNTs) were directly synthesized by a hydrogen arc-discharge method by using only Fe catalyst. The synthesized carbon materials indicated high-purity SWCNTs without amorphous carbon materials from SEM observation. The SWCNTs had diameters of 1.5-2.0 nm from TEM and Raman observation. After a simple purification, TGA indicated that SWCNTs had a purity of ca. 90.1 wt %. Field emission from the SWCNT emitters which were fabricated by using a spray method was measured by a diode structure. The vertically aligned SWCNT emitters showed the low turn-on voltage of 0.86 V/μm and a high emission-current density of 3 mA/cm2 at an applied field of about 3 V/μm. From a Fowler - Nordheim plot, the vertically aligned SWCNT revealed a high field enhancement factor of 2.35 × 104. The photoemission measurements, excited by a photon energy of 360 eV, showed significantly delocalized graphite-π states at the purified SWCNTs. Here, we investigated that the field-emission properties of SWCNTs would be attributed to the high electronic density of states near Fermi energy, including the delocalized graphite-π states.

Original languageEnglish
Pages (from-to)23742-23749
Number of pages8
JournalJournal of Physical Chemistry B
Volume110
Issue number47
DOIs
Publication statusPublished - 2006 Nov 30

ASJC Scopus subject areas

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

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