The reason for an upper limit to the height of spinnable carbon nanotube forests

The reason for the upper limit on the height of spinnable carbon nanotube (CNT) forests was studied. To analyze the differences between CNT forests with different heights, we synthesized CNT forests using different growth times (3, 6, 9, 12, 15, and 60 min). The height of the CNT forests increased f...

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Bibliographic Details
Published in:Journal of materials science 2013-10, Vol.48 (20), p.6897-6904
Main Authors: Lee, Jaegeun, Oh, Eugene, Kim, Hye-Jin, Cho, Seungho, Kim, Teawon, Lee, Sunghyun, Park, Junbeom, Kim, Hee Jin, Lee, Kun-Hong
Format: Article
Language:English
Subjects:
Analysis
Carbon nanotubes
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Disturbances
Forests
Forests and forestry
Materials Science
Morphology
Nanotubes
Polymer Sciences
Raman spectroscopy
Solid Mechanics
Synthesis
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Summary:The reason for the upper limit on the height of spinnable carbon nanotube (CNT) forests was studied. To analyze the differences between CNT forests with different heights, we synthesized CNT forests using different growth times (3, 6, 9, 12, 15, and 60 min). The height of the CNT forests increased from 260 μm at 3 min to 1.7 mm at 60 min, and the spinnability decreased sharply after 9 min of growth, where a wavy morphology first appeared. Raman analysis of the CNT forest grown for 9 min showed that the intensity ratio of G-band to D-band at the upper region was 1.50 and that near the bottom was 1.14. We also found that the reaction termination process affected the spinnability of the CNT forests. Depending on the termination process, both spinnable and non-spinnable CNT forests could be selectively synthesized, because of the different morphologies in their lower regions. The results suggested that any wavy morphology produced due to a disturbance in growth conditions causes a loss of spinnability.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-013-7494-3