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<p>In vacuum and display electronics, field emission (FE) electron sources are becoming increasingly common because of their low energy consumption, high efficiency, and fast reaction when compared to thermionic emission sources. Since the 1990s, carbon nanotubes (CNTs) have emerged as promising electron field emitters because of their small size, high aspect ratio, chemical stability, and excellent electrical and thermal conductivity. Recent studies show that CNT-based FE exhibits superior properties in practical applications and may replace conventional thermionic emission in various sectors. This paper offers a thorough analysis of the latest advancements in CNT field emitters, examining the factors influencing their performance, including type (single-walled versus multi-walled), vertical alignment, and work function. Single-walled CNTs (SWCNTs) often demonstrate superior FE properties due to their higher aspect ratio and smaller diameter. Vertical alignment enhances electron emission by maximizing the aspect ratio and reducing the screening effect. Lower-work-function materials result in better performance, while impurities like amorphous carbon degrade emission properties by increasing defects and work function. Additionally, the cathode–anode distance and gaseous environment significantly impact FE properties, with certain gases either enhancing or degrading performance. Optimizing patterned growth techniques to reduce the screening effect ensures effective emission from each CNT. Despite ongoing challenges, the advancements in CNT-based FE indicate a promising future for this technology.</p>

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Carbon Nanotubes as Emerging Field Emitters: Influencing Factors and Remedies

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Shama Parveen,
  • Mohd Sarvar,
  • Mohammad Zulfequar,
  • Javid Ali

摘要

In vacuum and display electronics, field emission (FE) electron sources are becoming increasingly common because of their low energy consumption, high efficiency, and fast reaction when compared to thermionic emission sources. Since the 1990s, carbon nanotubes (CNTs) have emerged as promising electron field emitters because of their small size, high aspect ratio, chemical stability, and excellent electrical and thermal conductivity. Recent studies show that CNT-based FE exhibits superior properties in practical applications and may replace conventional thermionic emission in various sectors. This paper offers a thorough analysis of the latest advancements in CNT field emitters, examining the factors influencing their performance, including type (single-walled versus multi-walled), vertical alignment, and work function. Single-walled CNTs (SWCNTs) often demonstrate superior FE properties due to their higher aspect ratio and smaller diameter. Vertical alignment enhances electron emission by maximizing the aspect ratio and reducing the screening effect. Lower-work-function materials result in better performance, while impurities like amorphous carbon degrade emission properties by increasing defects and work function. Additionally, the cathode–anode distance and gaseous environment significantly impact FE properties, with certain gases either enhancing or degrading performance. Optimizing patterned growth techniques to reduce the screening effect ensures effective emission from each CNT. Despite ongoing challenges, the advancements in CNT-based FE indicate a promising future for this technology.