TY - JOUR
T1 - One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface
AU - Hada, Masaki
AU - Hasegawa, Taisuke
AU - Inoue, Hirotaka
AU - Takagi, Makito
AU - Omoto, Kazuki
AU - Chujo, Daiki
AU - Iemoto, Shogo
AU - Kuroda, Taihei
AU - Morimoto, Taiga
AU - Hayashi, Takuma
AU - Iijima, Toru
AU - Tokunaga, Tomoharu
AU - Ikeda, Naoshi
AU - Fujimori, Kazuhiro
AU - Itoh, Chihiro
AU - Nishikawa, Takeshi
AU - Yamashita, Yoshifumi
AU - Kiwa, Toshihiko
AU - Koshihara, Shin ya
AU - Maeda, Satoshi
AU - Hayashi, Yasuhiko
N1 - Funding Information:
Some calculations were carried out on the Numerical Materials Simulator at NIMS. M.H. is grateful for the support from the Leading Initiative for Excellent Young Researchers (JSPS). We thank K. Kato, J. Ishikawa, and N. Oikawa at Advance Riko, Inc. for the measurements of thermal conductivities of CNT yarns.
Funding Information:
JSPS KAKENHI, grant numbers: JP15H02103, JP18H04519, and JP18H05208. JSPS WPI-ICReDD JST-CREST, grant number: JPMJCR14L5.
Publisher Copyright:
© 2019 American Chemical Society.
PY - 2019/10/28
Y1 - 2019/10/28
N2 - Interfaces in nanocarbon materials are highly important, as they determine the properties of carbon-based devices. In terms of carrier and thermal transport properties, the interfacial features are often more important than the intrinsic characteristics. Herein, we describe how 1 min Joule annealing of carbon nanotube (CNT) yarns can convert the interfacial amorphous carbon into graphene fragments. After 1 min Joule annealing, we have obtained multiwalled CNT yarns with extremely high Seebeck coefficients (±100 μV/K) and high thermoelectric power factor (400 and 1000 μW/mK2) at room temperature, both with or without polyethylenimine doping. Theoretical simulations and experimental measurements helped to determine the optimal annealing conditions in terms of a rapid transformation of the interfacial amorphous carbon between the bundled CNTs in the yarn into graphene fragments at â¼2000 K. The present approach represents significant progress in energy materials science, as it provides a guiding principle for the design of interfaces in nanocarbon materials with potential applications in energy-harvesting systems.
AB - Interfaces in nanocarbon materials are highly important, as they determine the properties of carbon-based devices. In terms of carrier and thermal transport properties, the interfacial features are often more important than the intrinsic characteristics. Herein, we describe how 1 min Joule annealing of carbon nanotube (CNT) yarns can convert the interfacial amorphous carbon into graphene fragments. After 1 min Joule annealing, we have obtained multiwalled CNT yarns with extremely high Seebeck coefficients (±100 μV/K) and high thermoelectric power factor (400 and 1000 μW/mK2) at room temperature, both with or without polyethylenimine doping. Theoretical simulations and experimental measurements helped to determine the optimal annealing conditions in terms of a rapid transformation of the interfacial amorphous carbon between the bundled CNTs in the yarn into graphene fragments at â¼2000 K. The present approach represents significant progress in energy materials science, as it provides a guiding principle for the design of interfaces in nanocarbon materials with potential applications in energy-harvesting systems.
KW - Joule annealing
KW - carbon nanotube
KW - interface of carbon nanostructure
KW - structure transition-route maps
KW - thermoelectric properties
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U2 - 10.1021/acsaem.9b01736
DO - 10.1021/acsaem.9b01736
M3 - Article
AN - SCOPUS:85073877262
VL - 2
SP - 7700
EP - 7708
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
SN - 2574-0962
IS - 10
ER -