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Investigation on Site Density of Carbon Nanotube Forests

Published online by Cambridge University Press:  01 February 2011

Zhengchun Liu
Affiliation:
liuz2@rpi.edu, Rensselaer Polytechnic Institute, Center for Integrated Electronics, 110 8th Street, CII 6015, Troy, NY, 12180, United States, 518-276-8763, 518-276-8761
Sang Hwui Lee
Affiliation:
lees@rpi.edu, Rensselaer Polytechnic Institute, Center for Integrated Electronics, 110 8th Street, Troy, NY, 12180, United States
Navdeep Bajwa
Affiliation:
bajwan@rpi.edu, Rensselaer Polytechnic Institute, Department of Materials Science and Engineering, 110 8th Street, Troy, NY, 12180, United States
Lijie Ci
Affiliation:
cil@rpi.edu, Rensselaer Polytechnic Institute, Department of Materials Science and Engineering, 110 8th Street, Troy, NY, 12180, United States
Swastik Kar
Affiliation:
kars@rpi.edu, Rensselaer Polytechnic Institute, Department of Materials Science and Engineering, 110 8th Street, Troy, NY, 12180, United States
Pulickel M. Ajayan
Affiliation:
ajayan@rpi.edu, Rensselaer Polytechnic Institute, Department of Materials Science and Engineering, 110 8th Street, Troy, NY, 12180, United States
Jian-Qiang Lu
Affiliation:
luj@rpi.edu, Rensselaer Polytechnic Institute, Center for Integrated Electronics, 110 8th Street, Troy, NY, 12180, United States
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Abstract

We report on a method for direct measurement of site density of vertically-aligned carbon nanotubes (CNTs). Site density is an important parameter of vertically-aligned carbon nanotube forests for various applications. By freezing the CNT forests in a polymer matrix and exposing the CNT ends, we obtained the site density of vertically aligned multi-walled CNTs through SEM observation and particle counting. Site densities of multi-walled CNTs grown by two different CVD processes, ferrocene/xylene process and Fe-Al/ethylene process, were measured to be ∼10 tubes/Ým2 and ∼53 tubes/Ým2, respectively. The results of site density distributions indicate non-uniform growth of carbon nanotubes at the micrometer scale in both processes.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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References

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