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Effect of the Conformation Changes of Polyelectrolytes on Organic Thermoelectric Performances

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Abstract

The relationship between the conformation of a polyelectrolyte and the performance of organic thermoelectric multilayers was studied. The conformational change of a weak polyelectrolyte via controlling assembling pH gave rise to a different thermoelectric behaviour in thin films. Organic thermoelectric multilayers were fabricated by alternately depositing bilayers (BL) of a positively-charged polyaniline (PANi) and multiwalled carbon nanotubes (MWNT), stabilized in poly(acrylic acid) (PAA), via a layer-by-layer assembly technique. The electrical conductivity and See-beck coefficient of PANi/MWNT-PAA nanocomposites were measured by varying assembly pH of PAA solutions. Altering the deposition pH of PAA resulted in different thermoelectric performances. A 40 BL thin film (∼210 nm thick) of PANi/MWNT-PAA assembled at pH 2.5/6.5 exhibited electrical conductivity of 95.2 S/cm and a Seebeck coefficient of 35 µV/K. This translates to a power factor of 11.7 µW/m·K2, which is 50 times higher than that of the same film with all components deposited at pH 2.5. Enhancement of thermoelectric behaviour in PANi/MWNT-PAA nanocomposites is attributed to a conjugated π-π network, together with a tightly packed nanostructure.

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Authors and Affiliations

  1. School of Aerospace & Mechanical Engineering, Korea Aerospace University, Goyang-si, Gyeonggi, 10540, Korea

    Kyungwho Choi

  2. Department of Carbon Convergence Engineering, College of Engineering, Wonkwang University, Iksan, 54538, Korea

    Jihun Son & Chungyeon Cho

  3. Department of Mechanical Engineering, Myongji University, 116 Myongji-ro, Cheoin-gu, Yongin, Gyeonggi, 17058, Korea

    Yong Tae Park

  4. Department of Engineering Chemistry, Chungbuk National University, Gaesin-Dong, Seowon-Gu, Cheongju, 28644, Korea

    Jung Sang Cho

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  1. Kyungwho Choi
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  2. Jihun Son
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  4. Jung Sang Cho
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  5. Chungyeon Cho
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Correspondence to Chungyeon Cho.

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Acknowledgment: This research was supported by Wonkwang University in 2020.

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Choi, K., Son, J., Park, Y.T. et al. Effect of the Conformation Changes of Polyelectrolytes on Organic Thermoelectric Performances. Macromol. Res. 28, 997–1002 (2020). https://doi.org/10.1007/s13233-020-8133-x

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  • DOI: https://doi.org/10.1007/s13233-020-8133-x

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