Enhancement of the field emission properties of low-temperature-growth multi-wall carbon nanotubes by KrF excimer laser irradiation post-treatment

Chia Hung Li*, Han Chi Liu, Shih Chun Tseng, Yi Ping Lin, Shih Pu Chen, Jung Yu Li, Kwang Hsiung Wu, Jenh-Yih Juang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Multi-wall carbon nanotube (CNT) films were fabricated by microwave plasma chemical vapor deposition at low temperatures (∼ 500 °C). The films when properly post-treated by laser irradiation exhibited a factor of 2-3 enhancement in the emission current, while the turn-on field (Eon) was reduced from 4.89-5.22 to 2.88-3.15 V/μm. The introduction of excessive oxygen during laser irradiation, however, degrades the performance of field emission properties drastically. Raman spectroscopy measurements revealed the intimate correlation between the parameter ID/IG (intensity ratio between the two representative Raman peaks seen in carbon nanotubes) and the field emission performance. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses showed that the irradiation-induced modification of the tube morphology and crystallinity might be responsible for the observations.

Original languageEnglish
Pages (from-to)2010-2014
Number of pages5
JournalDiamond and Related Materials
Volume15
Issue number11-12 SPEC. ISS.
DOIs
StatePublished - 1 Nov 2006

Keywords

  • Carbon nanotube
  • Field emission
  • Laser irradiation
  • Post-treatment

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