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Clean carbon nanotube field emitters aligned horizontally
Sung Mi Jung1, Joeoong Hahn, Hyun Young Jung
1Nano-materials Laboratory, Department of Chemistry, Seoul National University, Republic of Korea.
Nano Letters
|July 13, 2006
Summary
Fabricating horizontally aligned carbon nanotubes (CNTs) using electrophoresis and fissure techniques enhances field emission properties. Further detergent deposition and controlled firing significantly boost emission, though stability may decrease.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Field emitters are crucial for vacuum electronics.
- Carbon nanotubes (CNTs) offer excellent field emission properties.
- Improving CNT field emitter fabrication and performance is an active research area.
Purpose of the Study:
- To develop a novel fabrication method for horizontally aligned CNT field emitters.
- To investigate the impact of electrophoresis, fissure formation, and detergent treatment on CNT field emission.
- To optimize CNT field emitter performance without post-fabrication treatments.
Main Methods:
- Fabrication of horizontally aligned CNTs via electrophoresis deposition.
- Introduction of fissures through a firing process.
- Additional detergent deposition using electropholysis.
- Controlled adjustment of firing time to modify CNT structure.
Main Results:
- Achieved strong substrate adhesion and good field emission properties.
- Significantly enhanced field emission with additional detergent deposition.
- Increased field emission by cutting CNTs via extended firing, but reduced stability.
- Developed a method requiring no further post-fabrication treatment for field emission.
Conclusions:
- The combined electrophoresis, fissure formation, and detergent deposition technique is effective for fabricating high-performance CNT field emitters.
- Optimizing firing time allows for tuning the trade-off between field emission enhancement and stability.
- This method presents a promising, simplified approach for producing CNT field emitters.
