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

摘要: Single-walled carbon nanotubes (SWCNTs) were directly synthesized by a hydrogen arc-discharge method using only Fe catalyst. The materials indicated high-purity SWCNTs without amorphous from SEM observation. had diameters of 1.5-2.0 nm TEM and Raman After simple purification, TGA that purity ca. 90.1 wt %. Field emission the SWCNT emitters which fabricated spray was measured diode structure. vertically aligned showed low turn-on voltage 0.86 V/Im high emission-current density 3 mA/cm 2 at an applied field about V/Im. From Fowler-Nordheim plot, revealed enhancement factor 2.35 10 4 . photoemission measurements, excited photon energy 360 eV, significantly delocalized graphite-﷿ states purified SWCNTs. Here, we investigated field-emission properties would be attributed to electronic near Fermi energy, including graphite- ﷿ states.