[12a-N306-1~9] 17.1 Carbon nanotubes & other nanocarbon materials

[12a-N306-7] Fabrication of Densified Carbon Nanotube Fibers using Super Acids

〇(M1)Momoko Sakai¹, Toshihiko Fujimori^1,2, Yoshiya Kishibe¹, Daiji Yamashita², Takamasa Onoki², Takeshi Hikata², Soichiro Okubo², Keishi Akada¹, Jun-ichi Fujita¹ (1.Univ. of Tsukuba, 2.Sumitomo Electric Industries, Ltd.)

Keywords:carbon nanotube, densification

Carbon nanotube (CNTs) are expected to be the next-generation light-weight and high-strength materials because of their high tensile strength of 100 GPa. Despite extensive researches, CNT fibers exhibit far below the strength expected for individual CNTs mainly due to misalignment and low packing density. Our group has previously reported a method to synthesize aligned CNT fibers by using fast laminar flow of the process gas. Though the CNT fibers fabricated by our method show well-aligned structure, the packing density of as-grown CNT fiber is low due to the presence of voids and defects. In this study, we investigated the effect of chlorosulfonic acid (CSA) for the fabrication e of densified CNT fibers.
In this presentation, we will demonstrate that iron catalyst remaining in the CNT fibers decreases with longer immersion time in CSA, resulting in further densification of the fibers due to the reduction of structural voids involved in as-grown CNT fibers.