Thermoelectric properties of dispersant-free semiconducting single-walled carbon nanotubes sorted by a flavin extraction method

Huang, Wenxin; Toshimitsu, Fumiyuki; Ozono, Keizaburo; Matsumoto, Masamichi; Borah, Angana; Motoishi, Yuki; Park, K.-H.; Jang, Jae Won; Fujigaya, Tsuyohiko

doi:10.1039/c8cc10264c

Cited by 13 publications

(17 citation statements)

References 37 publications

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“…At the same time, the Seebeck coefficient of the metallic fraction was just 14 µV/K. The results of subsequent studies confirmed this trend many times [ 39 , 40 ]. The higher the s-SWCNTs/m-SWCNTs ratio (up to a certain threshold), the more suitable is the material for thermopower generation [ 41 ].…”

Section: Introductionmentioning

confidence: 58%

Thermoelectric Properties of Thin Films from Sorted Single-Walled Carbon Nanotubes

et al. 2020

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Single-walled carbon nanotubes (SWCNTs) remain one of the most promising materials of our times. One of the goals is to implement semiconducting and metallic SWCNTs in photonics and microelectronics, respectively. In this work, we demonstrated how such materials could be obtained from the parent material by using the aqueous two-phase extraction method (ATPE) at a large scale. We also developed a dedicated process on how to harvest the SWCNTs from the polymer matrices used to form the biphasic system. The technique is beneficial as it isolates SWCNTs with high purity while simultaneously maintaining their surface intact. To validate the utility of the metallic and semiconducting SWCNTs obtained this way, we transformed them into thin free-standing films and characterized their thermoelectric properties.

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Section: Introductionmentioning

confidence: 58%

Thermoelectric Properties of Thin Films from Sorted Single-Walled Carbon Nanotubes

et al. 2020

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“…Huang et al also demonstrated a flavin-based s-SWCNT extraction method, whereby the TE performance metrics were improved by 2 orders of magnitude when the flavin was fully removed from the s-SWCNT network. 273 The thermal conductivity of mixed SWCNTs and enriched s-SWCNTs has also received significant attention recently, with several intriguing questions remaining to be answered. Avery et al found that the thermal conductivity of undoped s-SWCNT networks was relatively high (k = 16.5 W m −1 K −1 ) and dominated by phonons because the network was not electrically conductive (Figure 25a).…”

Section: Carbon Nanomaterialsmentioning

confidence: 99%

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

et al. 2021

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Heat is an abundant but often wasted source of energy. Thus, harvesting just a portion of this tremendous amount of energy holds significant promise for a more sustainable society. While traditional solid-state inorganic semiconductors have dominated the research stage on thermal-to-electrical energy conversion, carbon-based semiconductors have recently attracted a great deal of attention as potential thermoelectric materials for low-temperature energy harvesting, primarily driven by the high abundance of their atomic elements, ease of processing/manufacturing, and intrinsically low thermal conductivity. This quest for new materials has resulted in the discovery of several new kinds of thermoelectric materials and concepts capable of converting a heat flux into an electrical current by means of various types of particles transporting the electric charge: (i) electrons, (ii) ions, and (iii) redox molecules. This has contributed to expanding the applications envisaged for thermoelectric materials far beyond simple conversion of heat into electricity. This is the motivation behind this review. This work is divided in three sections. In the first section, we present the basic principle of the thermoelectric effects when the particles transporting the electric charge are electrons, ions, and redox molecules and describe the conceptual differences between the three thermodiffusion phenomena. In the second section, we review the efforts made on developing devices exploiting these three effects and give a thorough understanding of what limits their performance. In the third section, we review the state-of-the-art thermoelectric materials investigated so far and provide a comprehensive understanding of what limits charge and energy transport in each of these classes of materials.

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“…Single-walled carbon nanotubes (SWCNTs) show unique electrical and optical properties [ 1 ]. Accordingly, the use of SWCNTs has led to important advances in the development of next-generation solar cells [ 2 , 3 ], field-effect transistors [ 4 , 5 ], and thermoelectric devices [ 6 , 7 ]. SWCNTs also show high mechanical durability owing to their extended π-conjugated lattices of sp 2 -bonded carbon atoms, yielding high-performance nanotube fibers [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Noncovalent Functionalization of Single-Walled Carbon Nanotubes with a Photocleavable Polythiophene Derivative

et al. 2021

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Single-walled carbon nanotubes (SWCNTs) have received extensive research attention owing to their extraordinary optical, electrical, and mechanical properties, which make them particularly attractive for application in optoelectronic devices. However, SWCNTs are insoluble in almost all solvents. Therefore, developing methods to solubilize SWCNTs is crucial for their use in solution-based processes. In this study, we developed a photocleavable polythiophene-derivative polymer dispersant for SWCNTs. The noncovalent surface functionalization of SWCNTs with a polymer allows their dispersal in tetrahydrofuran. The resultant solution-processed polymer/SWCNT composite film undergoes a hydrophobic-to-hydrophilic change in surface properties upon light irradiation (313 nm) because hydrophilic carboxyl groups are formed upon photocleavage of the hydrophobic solubilizing units in the polymer. Furthermore, the photocleaved composite film displays a 38-fold increase in electrical conductivity. This is due to the removal of the solubilizing unit, which is electrically insulating.

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Thermoelectric properties of dispersant-free semiconducting single-walled carbon nanotubes sorted by a flavin extraction method

Abstract: Flavin extraction method realized an improved power factor by easy removal of the dispersant from semiconducting SWNT sheet.

Cited by 13 publications

References 37 publications

Thermoelectric Properties of Thin Films from Sorted Single-Walled Carbon Nanotubes

Thermoelectric Properties of Thin Films from Sorted Single-Walled Carbon Nanotubes

Unconventional Thermoelectric Materials for Energy Harvesting and Sensing Applications

Noncovalent Functionalization of Single-Walled Carbon Nanotubes with a Photocleavable Polythiophene Derivative

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