Improved field emission properties of double-walled carbon nanotubes decorated with Ru nanoparticles

Chunli Liu, Kwang Sub Kim, Jihye Baek, Youngmi Cho, Seungwu Han, Soo Won Kim, Nam Ki Min, Youngmin Choi, Jong Ung Kim, Cheol Jin Lee

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

The field emission properties of double-walled carbon nanotubes (DWCNTs) were remarkably improved by decorating their surface with ruthenium (Ru) metal nanoparticles. The Ru nanoparticles were attached effectively on the surface of DWCNTs via a chemical procedure. The Ru-decorated DWCNTs showed lower turn-on voltage, higher emission current density, and improved emission uniformity compared with pristine DWCNTs. The effect of Ru nanoparticles on the work function and density of states was evaluated by the first-principles calculation. The enhanced field emission properties of Ru-DWCNTs were mainly attributed to the Ru nanoparticles which increased the field enhancement factor and the density of emission sites. Our results indicate that the Ru-decorated DWCNTs can be used as an effective field emitter for various field emission devices.

Original languageEnglish
Pages (from-to)1158-1164
Number of pages7
JournalCarbon
Volume47
Issue number4
DOIs
Publication statusPublished - 2009 Apr

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

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