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나노 구조 물리 연구단
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Field-induced stretching and dynamic reorientation of functionalized multiwalled carbon nanotube aggregates in nematic liquid crystals

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Title
Field-induced stretching and dynamic reorientation of functionalized multiwalled carbon nanotube aggregates in nematic liquid crystals
Author(s)
Tie, W.; Bhattacharyya, S.S.; Zhang, Y.; Zheng, Z.; Tae Hoon Lee; Sang Won Lee; Kim, T.H.; Young Hee Lee; Lee, S.H.
Publication Date
2016-01
Journal
CARBON, v.96, no., pp.548 - 556
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Multiwalled carbon nanotubes (MWCNTs) exhibited distinct electrical stretching behavior in nematic liquid crystals (NLC) depending on nanotube surface state. We found that two different samples prepared by chemical functionalization (f-CNT) and physical grinding (g-CNT) revealed distinct field dependence from each other. The threshold stretching field was lower in the f-CNT aggregates than in g-CNT aggregates. This was attributed to polar functionality induced weakened van der Waals interaction in f-CNTs, which was confirmed in infrared (IR) and Raman spectroscopy. Dynamic reorientation of f-CNTs was observed under polarized optical microscopy where f-CNTs were found to follow orientation of NLC director. Uniformly aligned f-CNTs also exhibited selective light absorption in sufficiently long transient field off-state which could find potential applications in memory and modulator devices as well as the versatile functional composites. © 2015 Elsevier Ltd
URI
https://pr.ibs.re.kr/handle/8788114/2196
ISSN
0008-6223
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Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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