Study of CNT synthesis mechanism by in-situ spectroscopy

Yun Shuo Hsieh, Yi Chun Chen, Hsiu Fung Cheng, I. Nan Lin

Research output: Contribution to journalArticle

2 Citations (Scopus)


Optical emission spectra (OES) of the plasma during synthesis of carbon nanotubes (CNTs) were in-situ examined for the purpose of understanding the formation mechanism of CNTs. It is observed that simultaneous presence of abundant amount of neutral Fe-atoms and the neutral (or singly-ionized) carbon-atoms in the plasma, but without the induction of carbon clusters, is necessary for growing CNTs. The optimum chamber pressure required is 400 Torr in 100 W microwave powers, which corresponds to 5000 K plasma temperature. The CNTs are presumed to form via gas phase nucleation process and thus obtained CNTs are multi-wall, approximately 30-70 nm in diameter.

Original languageEnglish
Pages (from-to)999-1003
Number of pages5
JournalDiamond and Related Materials
Issue number4-8
Publication statusPublished - 2004 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Chemistry(all)
  • Mechanical Engineering
  • Materials Chemistry
  • Electrical and Electronic Engineering

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