Electronic structure and field emission properties of in situ potassium-doped single-walled carbon nanotubes

Byeongchul Ha, Cheol Jin Lee

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In situ potassium (K)-doped single-walled carbon nanotube (SWCNT) was synthesized using a hydrogen arc-discharge method. X-ray photoelectron spectroscopy analysis showed that the K-doped SWCNTs consisted of 0.12% K mass composition. The K-doped SWCNTs showed the lower turn-on electric field of 2.0 Vμm at a current density of 10-9 A cm2 and the higher emission current density of 3.0 mA cm2 at an applied field of 4.6 Vμm compared with the undoped SWCNTs. The improved field emission performance of K-doped SWCNTs was mainly attributed to the decreased work function and the increased density of state near the Fermi energy.

Original languageEnglish
Article number023108
JournalApplied Physics Letters
Issue number2
Publication statusPublished - 2007 Jan 22


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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