Long-term stability of various carbon-nanotube-based micro-tip emitters

The electron emission property and long-term stability of the emission current in various field emitters based on carbon nanotubes (CNTs) with a CNT/catalyst/buffer/W-tip configuration were examined. CNT-based field emitters were fabricated by varying the buffer layers (TiN, Al/Ni/TiN) and the catal...

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Bibliographic Details
Published in:Diamond and related materials 2009-02, Vol.18 (2), p.486-489
Main Authors: Kim, Jong-Pil, Kim, Young-Kwang, Park, Chang-Kyun, Choi, Hae-Young, Shon, Chae-Hwa, Kim, Jong-Uk, Park, Jin-Seok
Format: Article
Language:English
Subjects:
Buffer materials
Carbon nanotubes
Catalysis
Catalysts: preparations and properties
Chemistry
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Field emission property
General and physical chemistry
Long-term stability
Materials science
Nanoscale materials and structures: fabrication and characterization
Nanotubes
Ni and Co catalysts
Other topics in nanoscale materials and structures
Physics
Structure and morphology
thickness
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Thin film structure and morphology
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Summary:The electron emission property and long-term stability of the emission current in various field emitters based on carbon nanotubes (CNTs) with a CNT/catalyst/buffer/W-tip configuration were examined. CNT-based field emitters were fabricated by varying the buffer layers (TiN, Al/Ni/TiN) and the catalyst materials (Ni, Co). The crystalline structure, surface morphologies, and nanostructures of all the grown CNTs were analyzed using Raman spectroscopy, field emission SEM, and high-resolution TEM. X-ray photoelectron spectroscopy (XPS) was used to monitor the chemical bonds of all the buffer and catalyst layers. When measured, the field emission characteristics showed the emitter that used the Al/Ni/TiN stacked buffer and the Co catalyst exhibited the best performance: a maximum emission current of 51 μA, a threshold field of 2.52 V/μm, and no degradation of emission current after a prolonged (up to 40 h) operation.
ISSN:0925-9635
1879-0062
DOI:10.1016/j.diamond.2008.10.019