Thermal deposition method for p–n patterning of carbon nanotube sheets for planar-type thermoelectric generator

Yamaguchi, Ryohei; Ishii, Taiki; Matsumoto, Masamichi; Borah, Angana; Tanaka, Naoki; Oda, Kaito; Tomita, Motohiro; Watanabe, Takanobu; Fujigaya, Tsuyohiko

doi:10.1039/d1ta02206g

Cited by 18 publications

(22 citation statements)

References 59 publications

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“…Hole (p-type) or electron (n-type) injection can be controlled by the molecular structure. To enhance the performance of photo-thermo-electric devices, p–n junctions are typically utilized to increase the alternative Seebeck coefficient of materials; therefore, as a pristine state under air conditions, n-dopants for p-CNTs are particularly important and have been developed in various methods, such as polyethyleneimine, nitrogen-containing molecules, , amidine-based molecules, imidazolium salts, − and supramolecular complexes. , However, the critical problem of the n-doped stability in air remains because the CNTs gradually accept holes from oxygen molecules (oxidations) in air and are dedoped to p-type in several days up to months. Furthermore, although the features of these dopants, which are soluble in water and alcohol, make it easy to fabricate devices, they have the disadvantage of impeding the wearable and outdoor use of CNT devices.…”

Section: Introductionmentioning

confidence: 99%

Outstanding Robust Photo- and Thermo-Electric Applications with Stabilized n-Doped Carbon Nanotubes by Parylene Coating

Suzuki

Nonoguchi

Shimamoto

et al. 2023

ACS Appl. Mater. Interfaces

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Stabilization techniques for n-doped carbon nanotubes (CNTs) are essential for the practical use of CNT devices. However, none of the reported n-dopants have sufficient robustness in a practical environment. Herein, we report a highly stable technique for fabricating n-doped CNT films. We elucidate the mechanism by which air stability can be achieved by completely covering CNTs with n-dopants to prevent oxidation; consequently, the stability is lost when exposed to scratches or moisture. Therefore, we introduce parylene as a protective layer for n-doped CNTs and achieve air stability for more than 365 d. Moreover, we demonstrate outstanding robust thermo-electric power generation from strong acids, alkalis, and alcohols, which cannot be realized with conventional air-stable n-dopants. The proposed stabilization technique is versatile and can be applied to various n-dopants. Thus, it is expected to be a key technology in the practical application of CNT devices.

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Section: Introductionmentioning

confidence: 99%

Outstanding Robust Photo- and Thermo-Electric Applications with Stabilized n-Doped Carbon Nanotubes by Parylene Coating

Suzuki

Nonoguchi

Shimamoto

et al. 2023

ACS Appl. Mater. Interfaces

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“…Therefore, we investigated several cationic surfactants dispersed in SWCNTs and estimated their thermoelectric properties with regard to air stability. The next step was to prepare all-carbon TEGs 34 . We prepared all-carbon TEGs, which consisted of p-type SWCNT films and SWCNT films with a cationic surfactant (n-type) on a flexible substrate, and measured the TEG performance.…”

Section: Introductionmentioning

confidence: 99%

Ultra-long air-stability of n-type carbon nanotube films with low thermal conductivity and all-carbon thermoelectric generators

Amma

Miura

Nagata

et al. 2022

Sci Rep

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This report presents n-type single-walled carbon nanotubes (SWCNT) films with ultra-long air stability using a cationic surfactant and demonstrates that the n-type Seebeck coefficient can be maintained for more than two years, which is the highest stability reported thus far to the best of our knowledge. Furthermore, the SWCNT films exhibit an extremely low thermal conductivity of 0.62 ± 0.08 W/(m·K) in the in-plane direction, which is very useful for thin-film TEGs. We fabricated all-carbon-nanotube TEGs, which use p-type SWCNT films and the n-type SWCNT films developed, and their air-stability was investigated. The TEGs did not degrade for 160 days and exhibited an output voltage of 24 mV, with a maximum power of 0.4 µW at a temperature difference of 60 K. These results open a pathway to enable the widespread use of carbon nanotube TEGs as power sources in IoT sensors.

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“…Therefore, we investigated several cationic surfactants dispersed in SWCNTs and estimated their thermoelectric properties with regard to air stability. The next step was to prepare all-carbon TEGs 34 . We prepared allcarbon TEGs, which consisted of p-type SWCNT lms and SWCNT lms with a cationic surfactant (ntype) on a exible substrate, and measured the TEG performance.…”

Section: Introductionmentioning

confidence: 99%

Ultra-long air-stability of n-type carbon nanotube films with low thermal conductivity and all-carbon thermoelectric generators

Amma

Miura

NAGATA

et al. 2022

Preprint

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This report presents n-type Single-walled carbon nanotubes (SWCNT) films with ultra-long air stability using a cationic surfactant and demonstrates that the n-type Seebeck coefficient can be maintained for more than two years, which is the highest stability reported thus far to the best of our knowledge. Furthermore, the SWCNT films exhibit an extremely low thermal conductivity of 0.62 ± 0.08 W/(m·K) in the in-plane direction, which is very useful for thin-film TEGs. We fabricated all-carbon-nanotube TEGs, which use p-type SWCNT films and the n-type SWCNT films developed, and their air-stability was investigated. The TEGs did not degrade for 160 days and exhibited an output voltage of 24 mV, with a maximum power of 0.4 uW at a temperature difference of 60 K. These results open a pathway to enable the widespread use of carbon nanotube TEGs as power sources in IoT sensors.

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Thermal deposition method for p–n patterning of carbon nanotube sheets for planar-type thermoelectric generator

Abstract: Thermal deposition of n-dopant onto SWCNT sheet (p-type) using patterned mask can fabricate p–n patterns with high special resolution. Thermoelectric generator using patterned SWCNT sheets exhibited power density of 60 nW cm−2 at ΔT = 25 °C.

Cited by 18 publications

References 59 publications

Outstanding Robust Photo- and Thermo-Electric Applications with Stabilized n-Doped Carbon Nanotubes by Parylene Coating

Outstanding Robust Photo- and Thermo-Electric Applications with Stabilized n-Doped Carbon Nanotubes by Parylene Coating

Ultra-long air-stability of n-type carbon nanotube films with low thermal conductivity and all-carbon thermoelectric generators

Ultra-long air-stability of n-type carbon nanotube films with low thermal conductivity and all-carbon thermoelectric generators

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