Air-Stable n-Type Single-Walled Carbon Nanotubes Doped with Benzimidazole Derivatives for Thermoelectric Conversion and Their Air-Stable Mechanism

Nakashima, Y.; Yamaguchi, Ryohei; Toshimitsu, Fumiyuki; Matsumoto, Masamichi; Borah, Angana; Staykov, Aleksandar; Islam, Md. Saidul; Hayami, Shinya; Fujigaya, Tsuyohiko

doi:10.1021/acsanm.9b01174

Cited by 60 publications

(70 citation statements)

References 60 publications

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“…This indicated that the amount of oxygen adsorption was reduced with the number of heat treatments. Therefore, we concluded that this phenomenon occurred because the surfactant was tightly linked with the SWCNTs, which prevented surface oxidation 45,46 . www.nature.com/scientificreports www.nature.com/scientificreports/ Spectroscopic analyses of SWCNT films with surfactants.…”

Section: Stability Of N-type Seebeck Coefficient In Swcnt Films With mentioning

confidence: 94%

“…As a result, the resulting www.nature.com/scientificreports www.nature.com/scientificreports/ SWCNT film has poor surfactant content. This study did not investigate the amount of surfactant required for n-type doping, but the surfactant content contributed to the stability of the n-type Seebeck coefficient 45 .…”

Section: Stability Of N-type Seebeck Coefficient In Swcnt Films With mentioning

confidence: 99%

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Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Seki

Nagata

Takashiri

2020

Sci Rep

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thermoelectric generators based on single-wall carbon nanotubes (SWcnts) have great potential for use in wearable and skin electronics because of their lightweight and mechanically soft structure. However, the fabrication of air-stable n-type thermoelectric SWcnts using conventional processes is challenging. Herein, we propose a facile process for fabricating air-stable n-type SWCNT films with anionic surfactants via drop casting followed by heat treatment. We examined different surfactants (Sodium Dodecyl Sulfate, Sodium Dodecylbenzene Sulfonate, and Sodium cholate) and heat-treatment temperatures. The optimal SWCNT film maintained the n-type Seebeck coefficient for 35 days. Moreover, to further extend the n-type Seebeck coefficient maintenance, we periodically reheated the SWCNT film with a surfactant that had returned to the p-type Seebeck coefficient. The reheated film recovered the n-type Seebeck coefficient, and the effect of the reheating treatment lasted for several reheating cycles. finally, we elucidated a simple mechanism for realizing an air-stable n-type Seebeck coefficient based on spectroscopic analyses of the SWCNT films.

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Section: Stability Of N-type Seebeck Coefficient In Swcnt Films With mentioning

confidence: 94%

Section: Stability Of N-type Seebeck Coefficient In Swcnt Films With mentioning

confidence: 99%

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Seki

Nagata

Takashiri

2020

Sci Rep

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“…Finally, to study the superiority of anisotropy control for TE power generation, a single cell structure was fabricated by doping half of the sheet using 2-(2-methoxyphenyl)-1,3-dimethyl-2,3-dihydro-1H-benzo[d]imidazole ( o -MeO-DMBI) [ 13 ] as an n-dopant, and the device was placed on a hot plate ( Figure 6(a )). By setting the temperature of the hot plate to 50°C, the temperature gradient between the middle and the end of the SWCNT-w/o was ca.…”

Section: Resultsmentioning

confidence: 99%

Control of anisotropic conduction of carbon nanotube sheets and their use as planar-type thermoelectric conversion materials

Matsumoto

Yamaguchi

Shima

et al. 2021

Science and Technology of Advanced Materials

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The large anisotropic thermal conduction of a carbon nanotube (CNT) sheet that originates from the in-plane orientation of one-dimensional CNTs is disadvantageous for thermoelectric conversion using the Seebeck effect since the temperature gradient is difficult to maintain in the current flow direction. To control the orientation of the CNTs, polymer particles are introduced as orientation aligners upon sheet formation by vacuum filtration. The thermal conductivities in the in-plane direction decrease as the number of polymer particles in the sheet increases, while that in the through-plane direction increases. Consequently, a greater temperature gradient is observed for the anisotropy-controlled CNT sheet as compared to that detected for the CNT sheet without anisotropy control when a part of the sheet is heated, which results in a higher power density for the planar-type thermoelectric device. These findings are quite useful for the development of flexible and wearable thermoelectric batteries using CNT sheets.

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“…Under these circumstances, many researchers have attempted to fabricate SWCNTs with n-type properties using various experimental approaches 26,27,28,29,30 . Nakashima et al prepared air-stable n-type SWCNTs doped with benzimidazole derivatives and discussed their air-stable mechanism 31 . Nonoguchi et al investigated new doping reagents of ordinary salts with crown ethers to create air-and thermally stable n-type SWCNTs 32 .…”

Section: Introductionmentioning

confidence: 99%

Origin of N-Type Thermoelectric Properties in Single-Wall Carbon Nanotube Films With Anionic Surfactants Investigated by Experimental Analyses and First-Principles Calculations

Yonezawa

Chiba

Seki

et al. 2020

Preprint

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We investigated the origin of n-type thermoelectric properties in single-wall carbon nanotube (SWCNT) films with anionic surfactants via experimental analyses and first-principles calculations. Several types of anionic surfactants were employed to fabricate SWCNT films via drop-casting, followed by heat treatment at various temperatures. In particular, SWCNT films with sodium dodecylbenzene sulfonate (SDBS) surfactant heated to 350°C exhibited a longer retention period, wherein the n-type Seebeck coefficient lasted for a maximum of 35 days. In the color mapping of atomic distribution, SWCNT films with SDBS surfactant exhibited a larger amount of sodium than oxygen on the SWCNT surface. The electronic band structure and density of states of SWCNTs with oxygen atoms, oxygen molecules, water molecules, sulfur atoms, and sodium atoms were analyzed using first-principles calculations. The calculations showed that sodium atoms and oxygen molecules moved the Fermi level closer to the conduction and valence bands, respectively. The water molecules, oxygen, and sulfur atoms did not affect the Fermi level. Therefore, SWCNT films exhibited n-type thermoelectric properties when the interaction between the sodium atoms and the SWCNTs was larger than that between the oxygen molecules and the SWCNTs.

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Air-Stable n-Type Single-Walled Carbon Nanotubes Doped with Benzimidazole Derivatives for Thermoelectric Conversion and Their Air-Stable Mechanism

Cited by 60 publications

References 60 publications

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Facile preparation of air-stable n-type thermoelectric single-wall carbon nanotube films with anionic surfactants

Control of anisotropic conduction of carbon nanotube sheets and their use as planar-type thermoelectric conversion materials

Origin of N-Type Thermoelectric Properties in Single-Wall Carbon Nanotube Films With Anionic Surfactants Investigated by Experimental Analyses and First-Principles Calculations

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