The stability of the CNT/Ni field emission cathode fabricated by the composite plating method
| Autor: | Bohr-Ran Huang, Ying-Kan Yang, Shien-Der Tzeng, Tzu-Ching Lin |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Scanning electron microscope Mechanical Engineering Ultra-high vacuum Analytical chemistry General Chemistry Microstructure Electronic Optical and Magnetic Materials Field electron emission Electric field Materials Chemistry Electrical and Electronic Engineering Joule heating Current density Common emitter |
| Zdroj: | Diamond and Related Materials. 19:158-161 |
| ISSN: | 0925-9635 |
| DOI: | 10.1016/j.diamond.2009.10.012 |
| Popis: | A novel composite plating method has been developed for the fabrication of carbon nanotube/Ni (CNT/Ni) field emission cathode. The field emission properties of the initial CNT/Ni field emitter show a low turn-on electric field E on of about 1.1 V/μm with an emission current density of 1 μA/cm 2 , and a low threshold electric field E th of about 1.7 V/μm with an emission current density of 1 mA/cm 2 . After performing a stability test with a high emission current density in high vacuum, the corresponding microstructure and the degree of graphitization of the CNT/Ni field emitter were measured by using scanning electron microscopy and Raman spectroscopy. We found that the degree of graphitization slowly decreases with the duration time t FE of the stability test, the size of small rod-like CNT/Ni composite structures in the film increases with t FE , and obvious cracks appear in the film as t FE is larger than 60 h. The degradation of the field emission properties may be explained by the Joule heating effect on the CNT/Ni field emitter under high emission current density. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect