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Updated: Oct 9, 2025
Author Spotlight: Advancements and Applications in Nanoparticle Synthesis Through Laser Ablation in Liquids
Published on: June 16, 2023
Nanocone-Shaped Carbon Nanotubes Field-Emitter Array Fabricated by Laser Ablation
Jiuzhou Zhao1,2, Zhenjun Li2,3, Matthew Thomas Cole4
1Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, China.
A new ultraviolet laser patterning technique reliably creates nanocone-shaped carbon nanotubes field-emitter arrays (NCNA). This method enhances field emission performance, offering lower turn-on fields and higher, more stable current densities for advanced electronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Physics
Background:
- Nanocone-shaped carbon nanotubes field-emitter arrays (NCNA) offer ideal field-emitter properties.
- Traditional fabrication methods for NCNA are often costly and complex, involving photolithography or wet chemistry.
- Achieving precise nanocone shapes via laser ablation is challenging due to limitations in focusing spot size.
Purpose of the Study:
- To develop a novel ultraviolet (UV) laser beam patterning technique for fabricating NCNA.
- To overcome the limitations of achieving fine nanocone structures using laser ablation.
- To improve the field emission characteristics of carbon nanotube arrays.
Main Methods:
- Utilized an optimized UV laser beam focusing technique.
- Leveraged unique carbon nanotube-light interaction properties.
- Developed a laser patterning method to create NCNA with a cone-tip radius of approximately 300 nm.
Main Results:
- Successfully fabricated NCNA with controlled nanocone shapes.
- Achieved a significant reduction in turn-on fields from 2.6 V/μm to 1.6 V/μm.
- Demonstrated a substantial increase in emission current density from 10 mA/cm² to 140 mA/cm² with improved stability.
Conclusions:
- The developed UV laser patterning technique reliably produces high-performance NCNA.
- This cost-effective and clean fabrication method offers a significant advancement over existing techniques.
- The technique holds potential for widespread application in manufacturing advanced field-emitter arrays.
