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

Title
Improved field emission properties of double-walled carbon nanotubes decorated with Ru nanoparticles
Authors
Liu C.Kim K.S.Baek J.Cho Y.Han S.Kim S.-W.Min N.-K.Choi Y.Kim J.-U.Lee C.J.
Ewha Authors
한승우
Issue Date
2009
Journal Title
Carbon
ISSN
0008-6223JCR Link
Citation
vol. 47, no. 4, pp. 1158 - 1164
Indexed
SCI; SCIE; SCOPUS WOS 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. © 2009 Elsevier Ltd. All rights reserved.
DOI
10.1016/j.carbon.2008.12.054
Appears in Collections:
자연과학대학 > 물리학전공 > Journal papers
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