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 language | English |
|---|---|
| Pages (from-to) | 23742-23749 |
| Number of pages | 8 |
| Journal | Journal of Physical Chemistry B |
| Volume | 110 |
| Issue number | 47 |
| DOIs | |
| Publication status | Published - 2006 Nov 30 |
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- Physical and Theoretical Chemistry
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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 journal › Article
}
TY - JOUR
T1 - Investigation of field emission and photoemission properties of high-purity single-walled carbon nanotubes synthesized by hydrogen Arc discharge
AU - Ha, Byeongchul
AU - Park, Jeunghee
AU - Kim, Shin Young
AU - Lee, Cheol Jin
PY - 2006/11/30
Y1 - 2006/11/30
N2 - 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.
AB - 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.
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U2 - 10.1021/jp0634407
DO - 10.1021/jp0634407
M3 - Article
VL - 110
SP - 23742
EP - 23749
JO - Journal of Physical Chemistry B Materials
JF - Journal of Physical Chemistry B Materials
SN - 1520-6106
IS - 47
ER -