Giant Seebeck coefficient in semiconducting single-wall carbon nanotube film

Nakai, Yusuke; Honda, Kazumasa; Yanagi, Kazuhiro; Kataura, Hiromichi; Kato, Teppei; Yamamoto, Takahiro; Maniwa, Yutaka

doi:10.7567/apex.7.025103

Cited by 220 publications

(249 citation statements)

References 23 publications

(45 reference statements)

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“…From a practical standpoint, these are important findings for lightweight heat spreaders and for thermoelectric energy harvesters. In particular, for thermoelectric applications, 15 our results underscore that the figure of merit (ZT) of a SWNT network sample cannot be estimated based on previously measured results on different samples. 14 Rather, the thermal conductivity of SWNT thermoelectrics must be measured independently, because these quantities are sensitive to the morphology and processing of the sample.…”

mentioning

confidence: 74%

“…5,14 The ability to tune thermal conductivity in SWNT materials leads to exciting applications for heat spreaders and insulators, as well as potential thermoelectric energy harvesters. 15 In this work, we simultaneously characterize the electrical and thermal properties of SWNT films with varying fractions of nanotube types (from 90% semiconducting to 90% metallic) by electrical measurements and infrared (IR) thermometry. Using an IR microscope, the real-time temperature profile of SWNT films under electrical bias is mapped.…”

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confidence: 99%

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Thermal conductivity of chirality-sorted carbon nanotube networks

Lian

Llinas

et al. 2016

Applied Physics Letters

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The thermal properties of single-walled carbon nanotubes (SWNTs) are of significant interest, yet their dependence on SWNT chirality has been, until now, not explored experimentally. Here we used electrical heating and infrared thermal imaging to simultaneously study thermal and electrical transport in chirality-sorted SWNT networks. We examined solution processed 90% semiconducting, 90% metallic, purified unsorted (66% semiconducting), and as-grown HiPco SWNT films.The thermal conductivities of these films range from 80 to 370 Wm -1 K -1 but are not controlled by chirality, instead being dependent on the morphology (i.e. mass and junction density, quasi-alignment) of the networks. The upper range of the thermal conductivities measured is comparable to that of the best metals (Cu and Ag) but with over an order of magnitude lower mass density. This study reveals important factors controlling the thermal properties of light-weight chirality-sorted SWNT films, for potential thermal and thermoelectric applications.

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confidence: 74%

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confidence: 99%

Thermal conductivity of chirality-sorted carbon nanotube networks

Lian

Llinas

et al. 2016

Applied Physics Letters

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“…Our results highlight potential properties of small diameter s-SWNTs as a one-dimensional thermoelectric material with a giant thermopower. With the recent advances in the fabrication methods for specific small diameter sSWNTs [14,31,32], we expect that the further potential development of s-SWNT thermoelectric devices could be realized in the near future. Here we derive a general formula for the thermopower of nondegenerate semiconductors as a starting point before deriving the analytical formula of S CNT [Eq.…”

Section: Discussionmentioning

confidence: 99%

“…By calculating the thermopower of all individual s-SWNTs within a diameter range 0.5 ≤ d t ≤ 1.5 nm, we will show that, for tube diameters less than 0.6 nm under low doping, the thermopower of s-SWNTs can be as large as 2000 µV/K at room temperature, which is large enough compared to the thermopower of bundled SWNTs, which is about 100 − 200 µV/K [6,8,14]. From this result, we believe that there is still much room available to improve the ZT of SWNT samples.…”

Section: Introductionmentioning

confidence: 99%

Diameter dependence of thermoelectric power of semiconducting carbon nanotubes

et al. 2015

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We calculate the thermoelectric power (or thermopower) of many semiconducting single wall carbon nanotubes (s-SWNTs) within a diameter range 0.5-1.5 nm by using the Boltzmann transport formalism combined with an extended tight-binding model. We find that the thermopower of sSWNTs increases as the tube diameter decreases. For some s-SWNTs with diameters less than 0.6 nm, the thermopower can reach a value larger than 2000 µV/K at room temperature, which is about 6 to 10 times larger than that found in commonly used thermoelectric materials. The large thermopower values may be attributed to the one-dimensionality of the nanotubes and to the presence of large band gaps of the small-diameter s-SWNTs. We derive an analytical formula to reproduce the numerical calculation of the thermopower and we find that the thermopower of a given s-SWNT is directly related with its band gap. The formula also explains the shape of the thermopower as a function of tube diameter, which looks similar to the shape of the so-called Kataura plot of the band gap dependence on tube diameter.

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“…metallicity (chirality), defect density, atomic doping) and morphology (e.g. individuals/junctions, dopant distribution) [17–20]. In this context, it is important to experimentally link structural factors to thermoelectric properties.…”

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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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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Giant Seebeck coefficient in semiconducting single-wall carbon nanotube film

Cited by 220 publications

References 23 publications

Thermal conductivity of chirality-sorted carbon nanotube networks

Thermal conductivity of chirality-sorted carbon nanotube networks

Diameter dependence of thermoelectric power of semiconducting carbon nanotubes

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

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