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 journalArticlepeer-review

114 Citations (Scopus)


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
Issue number4
Publication statusPublished - 2009 Apr

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation (KOSEF) NRL Program grant funded by the Korea government (MEST) (No. R0A-2008-000-20071-0) and supported by MOCIE of Energy of Korea through a Components and Materials Technology Development project (No. 5052-DG2-0081) and supported by the Korea Foundation for International Cooperation of Science and Technology (KICOS) through a grant provided by the MOST in K20601000002-07E0100-00220. This work was also supported by the Korea Basic Science Institute.

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science


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