Effects of Cs treatment on field emission properties of capped carbon nanotubes

Mohammad Khazaei, Yoshiyuki Kawazoe

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Within the methodology [M. Khazaei, A.A. Farajian, Y. Kawazoe, Phys. Rev. Lett. 95 (2005) 177602] based on first-principles electronic structure calculations, the effects of Cs treatment on current emissions and emission patterns of capped carbon nanotubes are considered at low deposition densities when the nanotubes are under an electric field 0.2 V/Å. The results show that the current emission from the cap with one adsorbed Cs is 3.4 times larger than the cap without any Cs. It is 9.6 times larger in the cap with two adsorbed Cs atoms. After Cs deposition the emission patterns become asymmetric (current emission from the carbon atoms located at the topmost pentagon ring close to Cs atoms is larger than the other atomic sites). There are very few localized states on Cs atoms. Hence, although the tunneling probability of electron emission from Cs atoms is significant, there is no current from Cs atoms. In addition, the effect of Cs on work function reduction of nanotubes is explained in terms of Cs deposition densities and the surface dipole moments.

Original languageEnglish
Pages (from-to)1501-1506
Number of pages6
JournalSurface Science
Volume601
Issue number6
DOIs
Publication statusPublished - 2007 Mar 15

Keywords

  • Carbon nanotube
  • Cesium
  • Current emission
  • Emission pattern
  • Field emission
  • Work Function

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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