Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules

Li, Xinxin; Yu, Zikun; Zhou, Haihua; Yang, Fan; Zhong, Fei; Mao, Xianhua; Li, Benzhang; Xin, Hu; Gao, Chunmei; Wang, Lei

doi:10.1021/acssuschemeng.0c08403

Cited by 23 publications

(35 citation statements)

References 48 publications

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“…Thermoelectric (TE) materials have been widely investigated as a promising way to fabricate power generators and cooling refrigerators without moving parts and are feasible for miniaturization, which enable the conversion between heat and electricity and solve the waste heat recovery problem. − Like the most current microelectronics, it is crucial for TE devices to obtain both p-type and n-type materials and control charge carrier density. , …”

Section: Introductionmentioning

confidence: 99%

Oxygen-Rich Polymer Polyethylene Glycol-Functionalized Single-Walled Carbon Nanotubes Toward Air-Stable n-Type Thermoelectric Materials

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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It is crucial for thermoelectric (TE) devices to obtain both p-type and n-type materials and control charge carrier density. However, n-type thermoelectric materials are quite deficient and have lower thermoelectric properties. We report one oxygen-rich polymer named polyethylene glycol (PEG) for converting p-type single-walled carbon nanotubes (SWCNTs) to air-stable n-type thermoelectric materials. When pristine SWCNTs were doped with 2 mg·mL–1 PEG in an ethanol solution, the optimal Seebeck coefficient of PEG/SWCNT composites reached −50.8 μV·K–1. The result of ultraviolet photoelectron spectroscopy demonstrated that the lone pair of oxygen atoms in the PEG chain has electron transferability to SWCNTs. According to the hard and soft acid and base theory, sodium hydroxide (NaOH) was further introduced to improve air stability and thermoelectric performance of doped SWCNTs. As a result, PEG/NaOH/SWCNT composites achieved the highest power factor of 173.8 μW·m–1·K–2 at 300 K. Meanwhile, their final changes in electrical conductivity and the Seebeck coefficient are less than 8% in the investigation of air stability over two months. Inspired by this finding, we fabricated the TE generator composed of the pristine p-type SWCNTs and n-type PEG/NaOH/SWCNT composites. The maximum output power of this robust TE device reached 5.3 μW at a temperature gradient of 76 K, which is superior to many reported TE devices. Moreover, the experimental procedure is attractive as a sustainable process for materials preparation. Our study has indicated that the oxygen-rich polymer-functionalized SWCNTs have huge potential for developing air-stable n-type carbon-based thermoelectric materials.

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Section: Introductionmentioning

confidence: 99%

Oxygen-Rich Polymer Polyethylene Glycol-Functionalized Single-Walled Carbon Nanotubes Toward Air-Stable n-Type Thermoelectric Materials

Wang

Yang

et al. 2021

ACS Appl. Mater. Interfaces

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“…Hall effect measurements were applied to elucidate the fundamental charge transport of the polymers films. − A gold electrode was deposited on the four corners of a polymer film to reduce contact resistance. The Hall effect measurements were performed using a custom-built Quantum Design PPMS system (Figure S11).…”

Section: Results and Discussionmentioning

confidence: 99%

Crystalline Domain Formation to Enable High-Performance Polymer Thermoelectrics Inspired by Thermocleavable Materials

Mao

Zheng

et al. 2021

ACS Appl. Mater. Interfaces

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Improving the electrical conductivity is an important role in realizing high thermoelectric performance of solutionprocessable polymers. Herein, a simple and robust approach to boost the mobility and doping efficiency of a diketopyrrolopyrrolebased copolymer with the introduction of thermocleavable side chains (PDPPS-X, where X is the molar ratio of the thermocleavable side chains and alkyl chains) is first provided. Notably, the incorporated thermocleavable groups can be effectively removed after thermal treatment and therefore contribute to the crystalline domain formation via hydrogen-bonded networks, which is critical for conductivity enhancements. Grazing incidence wide-angle X-ray scattering (GIWAXS) patterns give a clear indication that the thermal treatment of PDPPS-5 can greatly improve the structural arrangement, resulting in a significantly enhanced hole mobility (5.4 times that of PDPPS-0 without thermocleavable chains). Compared to PDPPS-0, a larger Fermi level shift is observed after doping PDPPS-5 with FeCl 3 , reflecting a better doping efficiency. Consequently, remarkably improved conductivity and power factor are achieved by PDPPS-5 after doping with 0.03 M FeCl 3 at room temperature, which are about 2.2 and 3.5 times higher than that of PDPPS-0 at the same testing condition, respectively. Moreover, PDPPS-5 achieved a maximum power factor of 57.5 μW m −1 K −2 at 404 K.

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“…Due to the unique planner structures of porphyrins, the Por‐5F/SWCNT composites display the maximum PF of 279.3 µW m −1 K −2 at ambient temperature, [ 138 ] which can easily form π–π staking between the Por‐5F and the π–surface of SWCNTs. [ 146 ] Currently, Wang and coworkers [ 139 ] also developed discotic liquid‐crystal 2,3,6,7,10,11‐hexakis(hexyloxy) triphenylene (HAT6). After being composited with SWCNT, HAT6/SWCNT films with the ratio of 4:1 obtained a maximum PF of 408.23 ± 48.96 µW m −1 K −2 at ambient.…”

Section: The Recent Progress Of Small Molecular Ote Materialsmentioning

confidence: 99%

Recent Advances and Prospects of Small Molecular Organic Thermoelectric Materials

Zhou

Zhang

Zheng

et al. 2022

Small

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Thermoelectric (TE) materials possess unique energy conversion capabilities between heat and electrical energy. Small organic semiconductors have aroused widespread attention for the fabrication of TE devices due to their advantages of low toxicity, large area, light weight, and easy fabrication. However, the low TE properties hinder their large‐scale commercial application. Herein, the basic knowledge about TE materials, including parameters affecting the TE performance and the remaining challenges of the organic thermoelectric (OTE) materials, are initially summarized in detail. Second, the optimization strategies of power factor, including the selection and design of dopants and structural modification of the dope‐host are introduced. Third, some achievements of p‐ and n‐type small molecular OTE materials are highlighted to briefly provide their future developing trend; finally, insights on the future development of OTE materials are also provided in this study.

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Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules

Cited by 23 publications

References 48 publications

Oxygen-Rich Polymer Polyethylene Glycol-Functionalized Single-Walled Carbon Nanotubes Toward Air-Stable n-Type Thermoelectric Materials

Oxygen-Rich Polymer Polyethylene Glycol-Functionalized Single-Walled Carbon Nanotubes Toward Air-Stable n-Type Thermoelectric Materials

Crystalline Domain Formation to Enable High-Performance Polymer Thermoelectrics Inspired by Thermocleavable Materials

Recent Advances and Prospects of Small Molecular Organic Thermoelectric Materials

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