N-DMBI Doping of Carbon Nanotube Yarns for Achieving High n-Type Thermoelectric Power Factor and Figure of Merit

Suzuki, Hiroo1,2; Kametaka, Jun1; Nakahori, Shinya1; Tanaka, Yuichiro1; Iwahara, Mizuki1; Lin, Haolu1; Manzhos, Sergei3; Kyaw, Aung Ko Ko4; Nishikawa, Takeshi1,2; Hayashi, Yasuhiko1,2

2024-03-01

10.1002/smtd.202301387

SMALL METHODS   影响因子和分区

2366-9608

["The application of carbon nanotube (CNT) yarns as thermoelectric materials for harvesting energy from low-grade waste heat including that generated by the human body, is attracting considerable attention. However, the lack of efficient n-type CNT yarns hinders their practical implementation in thermoelectric devices. This study reports efficient n-doping of CNT yarns, employing 4-(1, 3-dimethyl-2, 3-dihydro-1H-benzimidazole-2-yl) phenyl) dimethylamine (N-DMBI) in alternative to conventional n-dopants, with o-dichlorobenzene emerging as the optimal solvent. The small molecular size of N-DMBI enables highly efficient doping within a remarkably short duration (10 s) while ensuring prolonged stability in air and at high temperature (150 degrees C). Furthermore, Joule annealing of the yarns significantly improves the n-doping efficiency. Consequently, thermoelectric power factors (PFs) of 2800, 2390, and 1534 mu W m-1 K-2 are achieved at 200, 150, and 30 degrees C, respectively. The intercalation of N-DMBI molecules significantly suppresses the thermal conductivity, resulting in the high figure of merit (ZT) of 1.69x10-2 at 100 degrees C. Additionally, a pi-type thermoelectric module is successfully demonstrated incorporating both p- and n-doped CNT yarns. This study offers an efficient doping strategy for achieving CNT yarns with high thermoelectric performance, contributing to the realization of lightweight and mechanically flexible CNT-based thermoelectric devices.","N-type dry-spun CNT yarns using N-DMBI doping are successfully fabricated. Joule annealing at high temperatures (<= 2900 degrees C) significantly enhances crystallinity, resulting in higher power factors. A suitable solvent of o-dichlorobenzene is determined to realize efficient N-DMBI doping. A maximum power factor of 2800 mu W m-1 K-2 at 200 degrees C and high figure of merit of 1.69x10-2 at 100 degrees C are reported owing to the enhanced crystallinity and optimized N-DMBI doping. image"]

air-stable doping carbon nanotube yarns joule annealing N-DMBI doping thermoelectric properties

SCI ; EI

英语

其他

Japan Society for the Promotion of Science[JP21H01371]

Chemistry ; Science & Technology - Other Topics ; Materials Science

Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:001182502000001

WILEY-V C H VERLAG GMBH

Web of Science

1.Okayama Univ, Grad Sch Environm Life Nat Sci & Technol, Okayama 7008530, Japan
2.Okayama Univ, Fac Environm Life Nat Sci & Technol, Okayama 7008530, Japan
3.Tokyo Inst Technol, Sch Mat & Chem Technol, Ookayama 2-12-1,Meguro Ku, Tokyo 1528552, Japan
4.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China

Suzuki, Hiroo,Kametaka, Jun,Nakahori, Shinya,et al. N-DMBI Doping of Carbon Nanotube Yarns for Achieving High n-Type Thermoelectric Power Factor and Figure of Merit[J]. SMALL METHODS,2024.

Suzuki, Hiroo.,Kametaka, Jun.,Nakahori, Shinya.,Tanaka, Yuichiro.,Iwahara, Mizuki.,...&Hayashi, Yasuhiko.(2024).N-DMBI Doping of Carbon Nanotube Yarns for Achieving High n-Type Thermoelectric Power Factor and Figure of Merit.SMALL METHODS.

Suzuki, Hiroo,et al."N-DMBI Doping of Carbon Nanotube Yarns for Achieving High n-Type Thermoelectric Power Factor and Figure of Merit".SMALL METHODS (2024).