| AVS 54th International Symposium | |
| Nanometer-scale Science and Technology | Thursday Sessions |
| Session NS-ThP |
| Session: | Nanometer-Scale Science & Techology Poster Session II |
| Presenter: | S.Y. Lee, Sungkunkwan University, South Korea |
| Authors: | S.Y. Lee, Sungkunkwan University, South Korea D.H. Ryu, Sungkunkwan University, South Korea J.H. Yang, Sungkunkwan University, South Korea W.C. Choi, Sungkunkwan University, South Korea C.-Y. Park, Sungkunkwan University, South Korea |
| Correspondent: | Click to Email |
Because of their unique geometrical structure and high aspect ratio, many researchers have studied the potential applications of carbon nanotubes (CNTs) in field emission display and high current electron source that requires low turn on voltage, high current density and emission stability. To enhance the field emission properties of CNTs, the intertube distance, densities, alignments and work function are very important factors, so which have been extensively studied in recent years.1-4 However, as yet, the sensible solution have not been obtained. In this study, we report the field emission properties of CNT-emitters coated with noble metals(Au, Ag, etc.) and their alloy (Ag-Cu). The vertical aligned multi wall CNTs and the sequential noble metal coating are synthesized by DC-plasma chemical vapor deposition in ambient of the mixed gas (C2H2 and NH3) and DC-magnetron sputtering, respectively. The results of the field emission measurements show that the field emission properties of noble metal coated CNTs have remarkably improved in the emission current density and the turn on electric field. We can find one of the reason for the enhancement in the field emission properties from SEM images obtained from the samples before and after noble metal coating. The density of emitter can be controlled by the suitable coating conditions. Also, we can enhanced the contact resistance and the emission stability under coarse condition. We suggest that the enhanced filed emission performance of the noble metal coated CNTs emitters are attributed by the reducing the emitting sites and low work function, and low contact resistance. The details will be introduced.
1Advanced Materials 14 (20), 1464-1468 (2002)
2Applied Physics Letters 90, 013120 (2007)
3Chemical Physics Letters 434, 92-95 (2007)
4Applied Physics Letters 80 (13), 2392 (2002).