Influence of halogen elements in organic salts on n-type doping of CNT yarn for thermoelectric applications

Heriyanto, Aghnia Dinan Maulani; Cho, Yongyoon; Okamoto, Naofumi; Abe, Ryo; Pandey, Manish; Benten, Hiroaki; Nakamura, Masakazu

doi:10.1039/d3ra03755j

Cited by 4 publications

(4 citation statements)

References 55 publications

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“…In this work, the thermal conductivity was directly measured by a DC heating crossjunction method under a high vacuum condition, which is selected as the most reliable one for wire-like samples. 28,29 In general, the higher aligned CNT increases not only electrical conductivity but also thermal conductivity. 30 However, in this work, the correlation coefficient between the thermal conductivity and degree of orientation was nearly zero, as shown in Figure S6(d).…”

Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Yarns Tailored Using Dispersants and Surfactants for Flexible and Wearable Thermoelectric Generators

Nguyen,

Okamoto,

Abe

et al. 2024

ACS Appl. Nano Mater.

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Carbon nanotube (CNT) yarns have emerged as a promising candidate for flexible and fabric-type wearable thermoelectric devices. This study developed CNT yarns tailored by a low-cost, fast, and environmentally friendly CNT dispersion method using glycerol as a dispersant and polyoxyethylene(50) stearyl ether as a surfactant. A high power factor of 242 μW m −1 K −2 was obtained, which is ca. three times higher than that of the previous dispersion method. The significant contribution is the 2-fold increase of electrical conductivity (from 325 to 747 S cm −1 ), which originates from the higher degree of disentanglement in dispersion and better CNT alignment in the yarn. Another contribution is the suppression of the increase in thermal conductivity as a possible side effect of the CNT alignment, which is concluded to be due to the surfactant adsorbed on CNT bundles. As a result, the figure of merit ZT value was successfully improved by ca. a factor of 3.

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Section: Resultsmentioning

confidence: 99%

Carbon Nanotube Yarns Tailored Using Dispersants and Surfactants for Flexible and Wearable Thermoelectric Generators

Nguyen,

Okamoto,

Abe

et al. 2024

ACS Appl. Nano Mater.

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“…Among them, thermoelectric fibers with typical 1D macroscopic morphologies have garnered significant research attention. These fibers include carbon-based materials (such as CNTs) [43,[122][123][124][125][126][127][128][129][130], organic conducting polymers (such as PEDOT:PSS) [131][132][133][134][135][136][137][138][139][140][141][142][143][144][145][146][147], and some inorganic materials (such as core-shell structured thermoelectric fibers) [148][149][150][151]. Composite fibers have also been extensively studied, including composites of carbon and organic materials [42,[152][153][154][155][156][157][158][159][160][161], carbon and nano-inorganic materials [162], and composites of organic materials as matrices with nanoinorganic materials as fillers [163][164...…”

Section: Classifications Of Weavable Thermoelectricsmentioning

confidence: 99%

“…In recent years, the mostly focused carbon-based weavable thermoelectric materials are p-and n-type CNT fibers or yarns [122][123][124][125][126][127][128][129][130]. To illustrate the progress of carbon-based weavable thermoelectrics, figure 4(a) shows the fabrication of SWCNT-based yarns with n-and p-type segments.…”

Section: Carbon-based Weavable Thermoelectricsmentioning

confidence: 99%

Weavable thermoelectrics: advances, controversies, and future developments

Shi,

Sun,

et al. 2024

Mater. Futures

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Owing to the capability of the conversion between thermal energy and electrical energy and their advantages of lightweight, compactness, noise-free operation, and precision reliability, wearable thermoelectrics show great potential for diverse applications. Among them, weavable thermoelectrics, a subclass with inherent flexibility, wearability, and operability, find utility in harnessing waste heat from irregular heat sources. Given the rapid advancements in this field, a timely review is essential to consolidate the progress and challenge. Here, we provide an overview of the state of weavable thermoelectric materials and devices in wearable smart textiles, encompassing mechanisms, materials, fabrications, device structures, and applications from recent advancements, challenges, and prospects. This review can serve as a valuable reference for researchers in the field of flexible wearable thermoelectric materials and devices and their applications.

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“…Here, an example of liquid phase doping of CNT yarn with a quaternary ammonium salt as an n-type doping agent is presented. 18) CNT (eDIPS, EC1.5, Meijo Nano Carbon) was spun with polyoxyethylene stearyl ether (Emulgen 350, Kao Chemical) as a dispersing agent and heat-treated to a weak ntype. This can be a nice starting material for n-type doping because the p-type doping effect by air is suppressed.…”

Section: -5mentioning

confidence: 99%

Thermoelectric cloths using carbon nanotube yarn for wearable electronics

Nakamura,

Yamashita

2023

Jpn. J. Appl. Phys.

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The need for energy harvesting technology as a power source for isolated small electronic devices is increasing. Especially in wearable applications, body heat is one of the promising energy sources, and therefore thermoelectric technology is attracting attention. For such applications, the ease of installation and the user's comfortableness should be emphasized against coldness, stiffness, or stickiness. It is also essential to measure whether the required power can be generated at an acceptable cost without increasing or decreasing the naturally occurring heat flow. In this paper, we review the progress of thermoelectric cloths using carbon nanotube yarns, which have been studied by the authors with a consistent policy, including experimental and technical aspects, and propose a direction in which wearable thermoelectric generators should be developed. We hope this paper will also serve as a hint for those conducting similar research.

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Influence of halogen elements in organic salts on n-type doping of CNT yarn for thermoelectric applications

Abstract: Doping control of CNT is crucial in thermoelectric applications to maximize conversion efficiency. This study discovers the importance of the halogen element in the doping process of CNT by organic salts, simultaneously offering a stable n-type doping strategy.

Cited by 4 publications

References 55 publications

Carbon Nanotube Yarns Tailored Using Dispersants and Surfactants for Flexible and Wearable Thermoelectric Generators

Carbon Nanotube Yarns Tailored Using Dispersants and Surfactants for Flexible and Wearable Thermoelectric Generators

Weavable thermoelectrics: advances, controversies, and future developments

Thermoelectric cloths using carbon nanotube yarn for wearable electronics

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