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Improved field emission properties of double-walled carbon nanotubes decorated with Ru nanoparticles
- Authors
- Liu, Chunli; Kim, Kwang Sub; Baek, Jihye; Cho, Youngmi; Han, Seunywu; Kim, Soo-Won; Min, Nam-Ki; Choi, Youngmin; Kim, Jong-Ung; Lee, Cheol Jin
- Issue Date
- 4월-2009
- Publisher
- PERGAMON-ELSEVIER SCIENCE LTD
- Citation
- CARBON, v.47, no.4, pp.1158 - 1164
- Indexed
- SCIE
SCOPUS
- Journal Title
- CARBON
- Volume
- 47
- Number
- 4
- Start Page
- 1158
- End Page
- 1164
- ISSN
- 0008-6223
- 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. (C) 2009 Elsevier Ltd. All rights reserved.
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