Simple Salt‐Coordinated n‐Type Nanocarbon Materials Stable in Air

Nonoguchi, Yoshiyuki; Nakano, Motohiro; Murayama, Tomoko; Hagino, Harutoshi; Hama, Shota; Miyazaki, Kôji; Matsubara, Ryosuke; Nakamura, Masakazu; Kawai, Tsuyoshi

doi:10.1002/adfm.201600179

Cited by 255 publications

(285 citation statements)

References 53 publications

(63 reference statements)

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“…500 Semiconducting SWNTs also offer excellent performance as more conventional thermoelectrics; since the Seebeck coefficient depends on the density of states, tuning the Fermi level to a van Hove singularity, by either chemical or electrochemical doping, can increase performance significantly. 501 The use of hydroxide-and halide-doped SWCNTs counterbalanced by chelated alkali metal ions has been shown to create air-stable n-type thermoelectrics with promising performance 502 (figure of merit, ZT > 0.1). In addition, the combination of oxidative and reductive doping can produce the n-and p-type constituents needed for an effective thermopile.…”

Section: Current and Emerging Applicationsmentioning

confidence: 99%

Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes

et al. 2018

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Since the discovery of buckminsterfullerene over 30 years ago, sp 2 -hybridised carbon nanomaterials (including fullerenes, carbon nanotubes, and graphene) have stimulated new science and technology across a huge range of fields. Despite the impressive intrinsic properties, challenges in processing and chemical modification continue to hinder applications. Charged carbon nanomaterials (CCNs), formed via the reduction or oxidation of these carbon nanomaterials, facilitate dissolution, purification, separation, chemical modification, and assembly. This approach provides a compelling alternative to traditional damaging and restrictive liquid phase exfoliation routes. The broad chemistry of CCNs not only provides a versatile and potent means to modify the properties of the parent nanomaterial but also raises interesting scientific issues. This review focuses on the fundamental structural forms: buckminsterfullerene, single-walled carbon nanotubes, and single-layer graphene, describing the generation of their respective charged nanocarbon species, their interactions with solvents, chemical reactivity, specific (opto)electronic properties, and emerging applications. CONTENTS

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Section: Current and Emerging Applicationsmentioning

confidence: 99%

Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes

et al. 2018

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“…The small chloride anions (Cl − ) should interact efficiently with the positive charges on the PDDA main chains. Considering the “hard and soft acids and bases” rule, large anions such as TFSI might effectively compensate delocalized positive charges in the conjugated SWNT backbone. Considering the fully conjugated, narrow‐gap π‐electron SWNT systems, even these minor ionic interactions are crucial for inducing the progression of oxidative p‐type doping and tuning the doping level under ambient conditions…”

Section: Resultsmentioning

confidence: 99%

“…Single‐walled carbon nanotubes (SWNTs) have recently been recognized as an emergent thermoelectric material . The material's unique properties, such as high electrical conductivity, mechanical robustness, high flexibility, and lightness, are advantageous as an active substance for future flexible thermoelectric devices.…”

Section: Introductionmentioning

confidence: 99%

“…The low‐dimensional structure of SWNTs is expected to offer significant thermoelectric performance because of Mott's equation . In fact, a relatively large Seebeck coefficient and thermoelectric power factors have recently been identified in semiconducting SWNTs, those conducting polymer composites, and highly doped SWNTs . Shi and Majumdar carefully evaluated the large Seebeck coefficient of individual SWNTs using a micropatterned electrode .…”

Section: Introductionmentioning

confidence: 99%

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Synergistic Impacts of Electrolyte Adsorption on the Thermoelectric Properties of Single‐Walled Carbon Nanotubes

Nakano

Nakashima

Kawai

et al. 2017

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Single-walled carbon nanotubes are promising candidates for light-weight and flexible energy materials. Recently, the thermoelectric properties of single-walled carbon nanotubes have been dramatically improved by ionic liquid addition; however, controlling factors remain unsolved. Here the thermoelectric properties of single-walled carbon nanotubes enhanced by electrolytes are investigated. Complementary characterization with absorption, Raman, and X-ray photoelectron spectroscopy reveals that shallow hole doping plays a partial role in the enhanced electrical conductivity. The molecular factors controlling the thermoelectric properties of carbon nanotubes are systematically investigated in terms of the ionic functionalities of ionic liquids. It is revealed that appropriate ionic liquids show a synergistic enhancement in conductivity and the Seebeck coefficient. The discovery of significantly precise doping enables the generation of thermoelectric power factor exceeding 460 µW m K .

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“…[7][8][9][10][11][12][13] Very regretfully, the performance evaluation for the flexible TE devices is confused in the available literatures. In cases of low thermal conductivities for the neat polymers and their composite materials, their TE performance is always evaluated by power factor (PF = S 2 σ).…”

mentioning

confidence: 99%

Assembly Strategy and Performance Evaluation of Flexible Thermoelectric Devices

Wang

et al. 2019

Advanced Science

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Although organic and composite thermoelectric (TE) materials have witnessed explosive developments in the past five years, the research of flexible TE devices is rather limited. In particular, their assembly strategies and device performance reported in the literature cannot be directly compared, due to a variety of deviances including p‐ and n‐type component materials, shape and dimensions of p‐n flexible films, and applied temperature gradient (Δ T ). Here, three types of assembly strategies for flexible TE devices, that is, serial, folding, and stacking, are compared by fixing the corresponding experimental parameters. Furthermore, a convenient and general method to evaluate the flexible device performance (FDP) is put forward, that is, , where the maximum output power ( P max ) is divided by product mass ( m ), Δ T , and pair number of p‐n couples ( N ). The FDPs for the present serial, folding, and stacking devices are 11.13, 8.87, and 0.05 nW g −1 K −1 , respectively, confirming that the serial configuration is the best among the three strategies for flexible device fabrication. The preliminary evaluation method proposed herein will pave the way for a design strategy of flexible TE devices and speed up their applications in waste‐heat harvesting, e‐skin, wearable electronics, etc.

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Simple Salt‐Coordinated n‐Type Nanocarbon Materials Stable in Air

Cited by 255 publications

References 53 publications

Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes

Charged Carbon Nanomaterials: Redox Chemistries of Fullerenes, Carbon Nanotubes, and Graphenes

Synergistic Impacts of Electrolyte Adsorption on the Thermoelectric Properties of Single‐Walled Carbon Nanotubes

Assembly Strategy and Performance Evaluation of Flexible Thermoelectric Devices

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