Densification effect on field emission characteristics of CNT film emitters for electron emission devices

Si Eun Han, Hanbin Go, Hyunjea Lee, Cheol Jin Lee

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Field electron emission characteristics of the carbon nanotube (CNT) film emitters were investigated according to densification conditions such as nitric acid, acetic acid, and salicylic acid. The emission performance of the CNT film emitters was strongly affected by the densification conditions. Salicylic acid exhibits the best field electron emission properties of the CNT film emitters, followed by nitric acid and acetic acid. The efficient densification of the CNT film emitter by salicylic acid is caused by the role of polarity and p orbitals, nitric acid by hydrogen ions, and acetic acid by weak polarity. After the densification with salicylic acid, the turn-on field of the CNT film emitter decreases from 1.94 V μm−1 to 1.86 V μm−1, the threshold field decreases from 3.41 V μm−1 to 2.95 V μm−1, the emission current significantly increases from 20.92 mA to 43.98 mA, and the degradation rate from the long-term emission stability decreases from 49.9% to 21%. The improved emission characteristics are attributed to the increased emission sites at the CNT film and the increased electrical conductivity of the CNT film. The densification is a useful way to enhance the field electron emission properties of CNT film emitters.

Original languageEnglish
Article number065701
Issue number6
Publication statusPublished - 2024 Feb 5

Bibliographical note

Publisher Copyright:
© 2023 IOP Publishing Ltd.


  • carbon nanotube film conductivity
  • carbon nanotube film emitter
  • densification
  • field electron emission
  • van der Waals force

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering


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