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Improved field emission properties of double-walled carbon nanotubes decorated with Ru nanoparticles |
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| Authors: | Chunli Liu Jihye Baek Seungwu Han Nam-Ki Min Jong-Ung Kim |
| Affiliation: | a School of Electrical Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Republic of Korea b Department of Physics, Ewha Womans University, Seoul 120-750, Republic of Korea c CAE Team, R&D Center, Samsung SDI, Yongin 446-577, Republic of Korea d Department of Control and Instrumentation Engineering, Korea University, Jochiwon 339-700, Republic of Korea e Device Nano Materials Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea |
| 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. |
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