Tailored semiconducting carbon nanotube networks with enhanced thermoelectric properties

Avery, Azure D.; Zhou, Benjamin H.; Lee, Jounghee; Lee, Eui Sup; Miller, Elisa M.; Ihly, Rachelle; Wesenberg, Devin; Mistry, Kevin S.; Guillot, Sarah Lucienne; Zink, B. L.; Kim, Yong Hyun; Blackburn, Jeffrey L.; Ferguson, Andrew J.

doi:10.1038/nenergy.2016.33

Cited by 297 publications

(294 citation statements)

References 51 publications

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“…Investigating thermoelectric transport in single-walled carbon nanotubes (SWNTs) deepens our understanding of their electronic properties as a quasi-one dimensional material and potential as energy harvesting materials [1]. The investigation of SWNTs transport requires us to address two practical issues.…”

Section: Introductionmentioning

confidence: 99%

“…The technical background above has recently been applied in the investigation of thermoelectric transport. Ferguson and Blackburn have very recently investigated thermoelectric transport in doped semiconducting SWNT thin films [1,22]. Their reported power factors were approximately five times larger than those of s-SWNT films prepared by other separation methods.…”

Section: Introductionmentioning

confidence: 99%

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Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Nonoguchi

Takata

Goto

et al. 2018

Science and Technology of Advanced Materials

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The effects of polymer structures on the thermoelectric properties of polymer-wrapped semiconducting carbon nanotubes have yet to be clarified for elucidating intrinsic transport properties. We systematically investigate thickness dependence of thermoelectric transport in thin films containing networks of conjugated polymer-wrapped semiconducting carbon nanotubes. Well-controlled doping experiments suggest that the doping homogeneity and then in-plane electrical conductivity significantly depend on film thickness and polymer species. This understanding leads to achieving thermoelectric power factors as high as 412 μW m−1 K−2 in thin carbon nanotube films. This work presents a standard platform for investigating the thermoelectric properties of nanotubes.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Nonoguchi

Takata

Goto

et al. 2018

Science and Technology of Advanced Materials

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“…[15] Additionally,n onionic surfactants based on polypropylene oxide (PPO) and polyethylene oxide (PEO) have been used for controlling buoyancy for density gradientc entrifugation enabling chirality separation. [23][24][25] These examples give lessons in the use of surfactants as the situation demands. For example, it is easy to imagine that insulating surfactants suppress electric currenta tC NT/surfactant/CNT contacts.…”

Section: Introductionmentioning

confidence: 99%

Surfactant‐driven Amphoteric Doping of Carbon Nanotubes

Nonoguchi

Tani

Murayama

et al. 2018

Chemistry An Asian Journal

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Aqueous surfactant dispersion is the most typical starting step to functionalize materials consisting of carbon nanotubes, but the effects of surfactants on the electronic properties are stillu nclear.H ere we report how the functional groups of surfactants affect the electronic properties of carbon nanotube films. Using spectroscopic and thermoelectric characterization, we demonstrate that anionic and non-ionic surfactants contribute to the formation of p-type and n-type carbonn anotubes, respectively.A dditionally,p -type doping with oxygen adsorptioni sf ound to competew ith surfactants' doping. These findings are useful for designing the srarting carbon nanotube materials exhibitingd esirable electronic properties. Results and DiscussionHerein we show the effect of the functional groups in surfactants including sulfonate,c arboxylate, and nonionic polyethy- [a] Prof.

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“…The electric thermally conductivities of CNS will be smaller than 0.001 W m −1 K −1 assessed by the Wiedemann–Franz law, which has been proved reasonable for CNTs; therefore, the heat carried by electrons can be neglected, and the low k ⊥ in Figure A is contributed by mechanical vibrations in the air and CNTs. The k ⊥ is quite lower than k Air (0.026 W m −1 k −1 ), and also smaller than the k of CNT‐based TE materials, which is commonly larger than 0.4 W m −1 K −1 . Measurements carried out at high temperatures and Figure S2 also confirm that k ⊥ < k Air (Data S3).…”

mentioning

confidence: 84%

“…The electric conductivities ( σ ⊥ and σ ∥ ) are tested using the four point probe method, as shown in Figure B. Because the σ ⊥ of CNS mainly depends on that of CNTs, there is no large difference between σ ⊥ of CNS and σ of CNT/polymer nanocomposites, which is about 250 to 280 S m −1 . The σ of CNTs along the axis direction is higher than that along the radial direction; therefore, the σ ⊥ of CNS is smaller than σ ∥ .…”

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confidence: 99%

High cross‐plane thermoelectric performance of carbon nanotube sponge films

Huang

2019

Int J Energy Res

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Summary In this study, carbon nanotubes (CNTs) are packed to prepare CNT films with chemical‐vapor‐deposition method and vacuum filtration, then the films are piled up to make anisotropic three‐dimensional CNT sponges (CNS). This sponge is demonstrated to be a promising thermoelectric material. Its cross‐plane figure of merit (ZT⊥) is much larger than that along the in‐plane direction (ZT∥), and the maximum ZT⊥ is about 2.99 × 10−3 at 290 K. This high ZT⊥ is attributed to small thermal conductivity of CNS in ⊥ direction, because of small size of pores in CNS and the low k of CNTs along the radial direction.

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Tailored semiconducting carbon nanotube networks with enhanced thermoelectric properties

Cited by 297 publications

References 51 publications

Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Thickness-dependent thermoelectric power factor of polymer-functionalized semiconducting carbon nanotube thin films

Surfactant‐driven Amphoteric Doping of Carbon Nanotubes

High cross‐plane thermoelectric performance of carbon nanotube sponge films

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