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

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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 1

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ASJC Scopus subject areas

  • Chemistry(all)

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