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Structure and Field Electron Emission of Carbon Nanotubes Dependent on Growth Temperature

Published online by Cambridge University Press:  01 February 2011

Yoon Huh ,
Jeong Yong Lee ,
Tae Jae Lee ,
Seung Chul Lyu  and
Cheol Jin Lee
Yoon Huh
Affiliation:
Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea Rep.
Jeong Yong Lee
Affiliation:
Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea Rep.
Tae Jae Lee
Affiliation:
Dept. of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea Rep.
Seung Chul Lyu
Affiliation:
Dept. of Nano-Technology, Hanyang University, Seoul, 133-791, Korea Rep.
Cheol Jin Lee
Affiliation:
Dept. of Nano-Technology, Hanyang University, Seoul, 133-791, Korea Rep.
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 728: Symposium S – Functional Nanostructured Materials through Multiscale Assembly and Novel Patterning Techniques , 2002 , S8.31
Copyright
Copyright © Materials Research Society 2002

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