Abstract
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 ∼2000 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.
| Original language | English |
|---|---|
| Journal | ACS Applied Energy Materials |
| DOIs | |
| Publication status | Accepted/In press - Jan 1 2019 |
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Keywords
- carbon nanotube
- interface of carbon nanostructure
- Joule annealing
- structure transition-route maps
- thermoelectric properties
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Energy Engineering and Power Technology
- Electrochemistry
- Materials Chemistry
- Electrical and Electronic Engineering
Cite this
One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface. / Hada, Masaki; Hasegawa, Taisuke; Inoue, Hirotaka; Takagi, Makito; Omoto, Kazuki; Chujo, Daiki; Iemoto, Shogo; Kuroda, Taihei; Morimoto, Taiga; Hayashi, Takuma; Iijima, Toru; Tokunaga, Tomoharu; Ikeda, Naoshi; Fujimori, Kazuhiro; Itoh, Chihiro; Nishikawa, Takeshi; Yamashita, Yoshifumi; Kiwa, Toshihiko; Koshihara, Shin Ya; Maeda, Satoshi; Hayashi, Yasuhiko.
In: ACS Applied Energy Materials, 01.01.2019.Research output: Contribution to journal › Article
}
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
PY - 2019/1/1
Y1 - 2019/1/1
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 ∼2000 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 ∼2000 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 - carbon nanotube
KW - interface of carbon nanostructure
KW - Joule annealing
KW - structure transition-route maps
KW - thermoelectric properties
UR - http://www.scopus.com/inward/record.url?scp=85073877262&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85073877262&partnerID=8YFLogxK
U2 - 10.1021/acsaem.9b01736
DO - 10.1021/acsaem.9b01736
M3 - Article
AN - SCOPUS:85073877262
JO - ACS Applied Energy Materials
JF - ACS Applied Energy Materials
SN - 2574-0962
ER -