Structure and field electron emission of carbon nanotubes dependent on growth temperature

Yoon Huh, Jeong Yong Lee, Tae Jae Lee, Seung Chul Lyu, Cheol Jin Lee

Research output: Contribution to journalConference article

Abstract

This present work deals with the temperature dependence on the growth and structure of CNTs grown by thermal CVD. The vertically aligned CNTs are synthesized on iron (Fe)-deposited silicon oxide (SiO2) substrate by thermal CVD using acetylene gas at temperatures in the range 750-950°C. Configuration and structural characteristics of CNTs have been investigated using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). As the growth temperature increases from 750 to 950°C, the growth rate and the average diameter increase while the density decreases by a factor of about 2. TEM images show that the relative amount of crystalline graphitic sheets increases with increasing the growth temperature and a higher degree of crystalline perfection can be achieved at 950°C. The HRTEM images reveal consistently that the degree of crystalline perfection increases progressively as the growth temperature increases. This result demonstrates that the growth rate, diameter, density, and crystallinity of carbon nanotubes can be controlled with the growth temperature.

Original languageEnglish
Pages (from-to)127-131
Number of pages5
JournalMaterials Research Society Symposium - Proceedings
Volume728
DOIs
Publication statusPublished - 2002
Externally publishedYes
EventFunctional Nanostructured Materials through Multiscale Assembly and Novel Pattering Techniques - San Francisco, CA, United States
Duration: 2002 Apr 22002 Apr 5

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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