Ionic Dopant‐Encapsulating Single‐Walled Carbon Nanotube Films with Metal‐Like Electrical Conductivity

Iihara, Yu; Kawai, Tsuyoshi; Nonoguchi, Yoshiyuki

doi:10.1002/asia.201901750

Cited by 9 publications

(8 citation statements)

References 23 publications

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“…Similar behavior has been widely observed for both pristine 30 and doped CNT films, 7,31 and all of these superficially distinct regimes are commonly explained by the same process. Oxidation is due to atmospheric oxygen or water, 7,9,[30][31][32][33] which initially proceeds quickly, and then slows down as the accessible active surface decreases.…”

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confidence: 99%

Soluble alkali-metal carbon nanotube salts for n-type thermoelectric composites with improved stability

Dörling

Rodríguez‐Martínez

Álvarez-Corzo

et al. 2021

Applied Physics Letters

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We present a method to dissolve carbon nanotubes that simultaneously allows to prepare n-doped films. These films are composed of thinner bundles of longer tubes when compared to films prepared using surfactants and sonication. Their negative Seebeck coefficient and high electrical conductivity make them good candidates for thermoelectric applications. We investigate their stability in air by aging them at elevated temperatures, showing stabilities over 500 h, which is further improved by the use of crown ethers. Finally, we demonstrate the usefulness of the prepared materials by fabricating an organic thermoelectric generator comprising 40 legs.

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confidence: 99%

Soluble alkali-metal carbon nanotube salts for n-type thermoelectric composites with improved stability

Dörling

Rodríguez‐Martínez

Álvarez-Corzo

et al. 2021

Applied Physics Letters

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“…With increasing IL concentration, the C1s peak shifts toward higher values, indicating that the electron density decreases, attributed to the strengthened electrostatic adsorption between carbon and IL. Generally, carbon atoms are abundant with free electron clouds, where [EMIM] + shows great potential to be electrostatically adsorbed. ,,, Therefore, although no component and structure change happens after [EMIM:DCA] blending, there are still interactions between [EMIM:DCA] and EG 70 CF 27 PF 3 , which induce the temperature-dependent p–n conversion. We also performed in situ Raman spectra of EG 70 CF 27 PF 3 IL 6 at 298, 353, 413, and 473 K, as indicated by Figure e, from which specific D, G, and G′ bands appear at ∼1330, 1580, and 2680 cm –1 , respectively, indicating typical carbon characteristics regardless of the operating temperature.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast and Cost-Effective Fabrication of High-Performance Carbon-Based Flexible Thermoelectric Hybrid Films and Their Devices

Sun,

Shi,

et al. 2023

ACS Appl. Mater. Interfaces

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Due to their cost-effectiveness and industry-scale feasibility, carbon-based composites have been considered to be promising thermoelectric materials for low-grade power generation. However, current fabrications for carbon-based composites are time-consuming, and their thermoelectric properties are still low. Herein, we develop an ultrafast and cost-effective hot-pressing method to fabricate a novel carbon-based hybrid film, which consists of ionic liquid/phenolic resin/carbon fiber/expanded graphite. This method only costs no more than 15 min. We found that the expanded graphite as the major component enables high flexibility and the introduction of phenolic resin and carbon fiber enhances the shear resistance and toughness of the film, while the ion-induced carrier migration contributes to a high power factor of 38.7 μW m–1 K–2 at 500 K in the carbon-based hybrid film. After the comparison based on the ratios between the power factor with fabrication time and cost among the current conventional carbon-based thermoelectric composites, our hybrid films show the best cost-effective property. Besides, a flexible thermoelectric device, assembled by the as-designed hybrid films, shows a maximum output power density of 79.3 nW cm–2 at a temperature difference of 20 K. This work paves a new way to fabricate cost-effective and high-performance carbon-based thermoelectric hybrids with promising application potential.

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“…In contrast, when filling the same dopants inside the hollow core of SWCNTs, higher doping levels and electrical conductivity have been observed, the reasons for which are not entirely clear so far. [70,137]…”

Section: Doping Methodsmentioning

confidence: 99%

Molecular Doping Modulation and Applications of Structure‐Sorted Single‐Walled Carbon Nanotubes: A Review

Liu,

Zhao,

Kang

et al. 2023

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Single‐walled carbon nanotubes (SWCNTs) that have a reproducible distribution of chiralities or single chirality are among the most competitive materials for realizing post‐silicon electronics. Molecular doping, with its non‐destructive and fine‐tunable characteristics, is emerging as the primary doping approach for the structure‐controlled SWCNTs, enabling their eventual use in various functional devices. This review provides an overview of important advances in the area of molecular doping of structure‐controlled SWCNTs and their applications. The first part introduces the underlying physical process of molecular doping, followed by a comprehensive survey of the commonly used dopants for SWCNTs to date. Then, it highlights how the convergence of molecular doping and structure‐sorting strategies leads to significantly improved functionality of SWCNT‐based field‐effect transistor arrays, transparent electrodes in optoelectronics, thermoelectrics, and many emerging devices. At last, several challenges and opportunities in this field are discussed, with the hope of shedding light on promoting the practical application of SWCNTs in future electronics.

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Ionic Dopant‐Encapsulating Single‐Walled Carbon Nanotube Films with Metal‐Like Electrical Conductivity

Cited by 9 publications

References 23 publications

Soluble alkali-metal carbon nanotube salts for n-type thermoelectric composites with improved stability

Soluble alkali-metal carbon nanotube salts for n-type thermoelectric composites with improved stability

Ultrafast and Cost-Effective Fabrication of High-Performance Carbon-Based Flexible Thermoelectric Hybrid Films and Their Devices

Molecular Doping Modulation and Applications of Structure‐Sorted Single‐Walled Carbon Nanotubes: A Review

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