The 81st JSAP Autumn Meeting, 2020

Presentation information

Oral presentation

17 Nanocarbon Technology » 17.1 Carbon nanotubes & other nanocarbon materials

[11a-Z28-1~16] 17.1 Carbon nanotubes & other nanocarbon materials

Fri. Sep 11, 2020 8:30 AM - 12:45 PM Z28

Toshiya Okazaki(AIST)

11:30 AM - 11:45 AM

[11a-Z28-12] Optical and Thermoelectric Properties of Ultrahigh-Conductivity Double-Wall Carbon Nanotube Films and Fibers

〇(D)Natsumi Komatsu1, Yota Ichinose2, Oliver Dewey1, Lauren Taylor1, Mitchell Trafford1, Yohei Yomogida2, Matteo Pasquali1, Kazuhiro Yanagi2, Junichiro Kono1 (1.Rice Univ., 2.Tokyo Metropolitan Univ.)

Keywords:Carbon nanotubes, Thermoelectric

Recently, it has been shown that macroscopically aligned metallic carbon nanotube films with an optimized Fermi energy (EF) are promising for thermoelectric applications. They exhibited surprisingly high power factors (σS2), maintaining both high values of Seebeck coefficient (S) and electrical conductivity (σ) due to sharp features in the electronic density of states near the EF. Here, we chemically changed the EF of aligned double-wall carbon nanotube (DWCNT) films and fibers and studied their optical and thermoelectric properties. Absorbance spectra for chlorosulfonic acid (CSA) doped and annealed DWCNT films prepared by a facile blade coating technique showed that the E11 and E22 exciton peaks in outer-wall semiconducting CNTs (So11 and So22) were suppressed in the CSA-doped film due to Pauli blocking, allowing us to estimate EF. Then we prepared aligned DWCNT fibers by a CSA solution spinning technique, chemically tuned EF, and obtained a power factor value of 14±5 mWm-1K-2, which is the highest p-type power factor ever achieved at room temperature.