Magnetic orientation of single-walled carbon nanotubes or their composites using polymer wrapping

Hiroaki Yonemura, Yuuichi Yamamoto, Sunao Yamada, Yoshihisa Fujiwara, Yoshifumi Tanimoto

Research output: Contribution to journalArticle

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Abstract

The magnetic orientation of single-walled carbon nanotubes (SWNTs) or the SWNT composites wrapped with polymer using poly[2-methoxy-5-(2′- ethylhexyloxy)-1,4-phenylene vinylene] (MEHPPV) as the conducting polymer were examined. The formation of SWNT/MEHPPV composites was confirmed by examining absorption and fluorescence spectra. The N,N-dimethylformamide solution of SWNT/MEHPPV composites or the aqueous solution of the shortened SWNTs was introduced dropwise onto a mica or glass plate. The magnetic processing of the composites or the SWNTs was carried out using a superconducting magnet with a horizontal direction (8 T). The AFM images indicated that the SWNT/MEHPPV composites or the SWNTs were oriented randomly without magnetic processing, while with magnetic processing (8 T), they were oriented with the tube axis of the composites or the SWNTs parallel to the magnetic field. In polarized absorption spectra of SWNT/MEHPPV composites on glass plates without magnetic processing, the absorbance due to semiconducting SWNT in the near-IR region in horizontal polarized light was almost the same as that in vertical polarized light. In contrast, with magnetic processing (8 T), the absorbance due to semiconducting SWNT in the horizontal polarization direction against the direction of magnetic field was stronger than that in the vertical polarization direction. Similar results were obtained from the polarized absorption spectra for the shortened SWNTs. These results of polarized absorption spectra also support the magnetic orientation of the SWNT/MEHPPV composites or the SWNTs. On the basis of a comparison of the composites and the SWNTs alone, the magnetic orientation of SWNT/MEHPPV composites is most likely ascribable to the anisotropy in susceptibilities of SWNTs.

Original languageEnglish
Article number024213
JournalScience and Technology of Advanced Materials
Volume9
Issue number2
DOIs
Publication statusPublished - Apr 1 2008

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Single-walled carbon nanotubes (SWCN)
Polymers
Composite materials
Absorption spectra
Processing
Light polarization
Polarization
Magnetic fields
Glass
Dimethylformamide
Superconducting magnets
Mica
Conducting polymers

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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Magnetic orientation of single-walled carbon nanotubes or their composites using polymer wrapping. / Yonemura, Hiroaki; Yamamoto, Yuuichi; Yamada, Sunao; Fujiwara, Yoshihisa; Tanimoto, Yoshifumi.

In: Science and Technology of Advanced Materials, Vol. 9, No. 2, 024213, 01.04.2008.

Research output: Contribution to journalArticle

Yonemura, Hiroaki ; Yamamoto, Yuuichi ; Yamada, Sunao ; Fujiwara, Yoshihisa ; Tanimoto, Yoshifumi. / Magnetic orientation of single-walled carbon nanotubes or their composites using polymer wrapping. In: Science and Technology of Advanced Materials. 2008 ; Vol. 9, No. 2.
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