Photo-induced Aggregation of Single-walled Carbon Nanotubes from Dispersion by Using a Photochromic Dispersant

Yuki Seki; Kazuki Matsunaga; Yuting Ke; Toma Takebayashi; Masaya Ninoyu; Keiju Kakugawa; Vannajan Sanghiran Lee; Shigeru Takahara

doi:10.2494/photopolymer.32.271

Yuki Seki, Kazuki Matsunaga, Yuting Ke, Toma Takebayashi, Masaya Ninoyu, Keiju Kakugawa, Vannajan Sanghiran Lee, Shigeru Takahara

Author information

Yuki Seki
Department of Materials Science, Graduate School of Engineering, Chiba University
Kazuki Matsunaga
Department of Materials Science, Graduate School of Engineering, Chiba University
Yuting Ke
Department of Materials Science, Graduate School of Engineering, Chiba University
Toma Takebayashi
Department of Materials Science, Graduate School of Engineering, Chiba University
Masaya Ninoyu
Department of Materials Science, Graduate School of Engineering, Chiba University
Keiju Kakugawa
Department of Materials Science, Graduate School of Engineering, Chiba University
Vannajan Sanghiran Lee
Department of Physics, Faculty of Science, University of Malaya, Jalan Universiti
Shigeru Takahara
Department of Materials Science, Graduate School of Engineering, Chiba University

Keywords: Aggregation, Photochromism, Singlet oxygen, Endoperoxide, Carbon nanotube, π-π stacking, Functional dispersant

JOURNAL FREE ACCESS

2019 Volume 32 Issue 2 Pages 271-278

DOI https://doi.org/10.2494/photopolymer.32.271

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Abstract

Dipropylheterocoerdianthrone (DPHCD) was found to be a potential photo-reactive dispersant of single-walled carbon nanotubes (SWNTs). DPHCD was able to well disperse SWNTs in chloroform. DPHCD is easily photo-oxidized by the irradiation of visible light to form the endoperoxide with a bent structure under oxygen or air atmosphere. Then, SWNTs were photo-precipitated from the DPHCD/SWNTs dispersion. The precipitation was able to disperse again after the photochromic reaction to turn back DPHCD from the endoperoxide and sonication. Such photo-induced precipitation was also observed in DPHCD/SWNTs complex film. The SWNTs precipitates were analyzed by FT-IR and Raman spectra measurements, and discussed about selectivity of DPHCD on chirality, and elimination of the dispersant.

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