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

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arc discharges
Photoemission
Single-walled carbon nanotubes (SWCN)
Field emission
field emission
Hydrogen
purity
photoelectric emission
carbon nanotubes
hydrogen
Graphite
emitters
graphite
Electronic density of states
carbon
Amorphous carbon
Fermi level
purification
Purification
sprayers

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Investigation of field emission and photoemission properties of high-purity single-walled carbon nanotubes synthesized by hydrogen Arc discharge. / Ha, Byeongchul; Park, Jeunghee; Kim, Shin Young; Lee, Cheol Jin.

In: Journal of Physical Chemistry B, Vol. 110, No. 47, 30.11.2006, p. 23742-23749.

Research output: Contribution to journalArticle

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