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Investigation of the Impact of the Anionic Moiety of Imidazolium-Based Ionic Liquids on the Thermoelectric Properties of Polypyrrole.

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Title: Investigation of the Impact of the Anionic Moiety of Imidazolium-Based Ionic Liquids on the Thermoelectric Properties of Polypyrrole.
Authors: Mokrani, Mohamed Ali1 (AUTHOR) mohamedalimokrani95@gmail.com, Bekkar Djelloul Sayah, Zakaria1 (AUTHOR) bekkar_zakaria@yahoo.fr, Chabane, Houssém1 (AUTHOR), Mekki, Ahmed1 (AUTHOR), Bourenane Cherif, Younes1 (AUTHOR), Nedjar, Linda1 (AUTHOR), Kaufa, Mammar1 (AUTHOR), Slimani, Zineb Yasmine1 (AUTHOR), Manseri, Amar2 (AUTHOR), Livi, Sébastien3 (AUTHOR), Durastanti, Jean-Felix4 (AUTHOR)
Source: Journal of Electronic Materials. May2026, Vol. 55 Issue 5, p4043-4063. 21p.
Subjects: Polypyrrole, Ionic liquids, Seebeck coefficient, Composite materials, Thermal conductivity, Thermoelectric materials, Electric conductivity
Abstract: This study explores the influence of the anionic moiety of imidazolium-based ionic liquids (ILs) on the thermoelectric properties of polypyrrole (PPy). The selected ionic liquids have gained significant attention due to their interesting electrical and thermal properties, which can enhance the thermoelectric performance of polymer-based materials. In this work, a series of polypyrrole-based composite materials were processed with different imidazolium ILs, varying the nature of the counter anions to investigate their effect on the electrical conductivity, Seebeck coefficient, and thermal conductivity of the polymer. Through a combination of physicochemical and thermoelectric characterization, including Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and thermoelectric measurements, the effect of the ionic liquid on the physicochemical and thermoelectric properties of polypyrrole was investigated. The results demonstrated that the anionic structure plays a key role in enhancing the thermoelectric properties of PPy. In fact, the incorporation of 1-ethyl-3-methylimidazolium tetrachloroferrate(III) (EMImFeCl4) led to a significant improvement in the Seebeck coefficient (S = 384.615 µV·K−1), with PPy-EMImFeCl4 showing the most notable increase in terms of figure of merit (ZT = 5.109 × 10−3), which was approximately 250 times that of the neat polypyrrole. This effect is also attributed to the ability of EMImFeCl4 to reduce the thermal conductivity (κ = 0.069 W·m−1·K−1). [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:This study explores the influence of the anionic moiety of imidazolium-based ionic liquids (ILs) on the thermoelectric properties of polypyrrole (PPy). The selected ionic liquids have gained significant attention due to their interesting electrical and thermal properties, which can enhance the thermoelectric performance of polymer-based materials. In this work, a series of polypyrrole-based composite materials were processed with different imidazolium ILs, varying the nature of the counter anions to investigate their effect on the electrical conductivity, Seebeck coefficient, and thermal conductivity of the polymer. Through a combination of physicochemical and thermoelectric characterization, including Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and thermoelectric measurements, the effect of the ionic liquid on the physicochemical and thermoelectric properties of polypyrrole was investigated. The results demonstrated that the anionic structure plays a key role in enhancing the thermoelectric properties of PPy. In fact, the incorporation of 1-ethyl-3-methylimidazolium tetrachloroferrate(III) (EMImFeCl4) led to a significant improvement in the Seebeck coefficient (S = 384.615 µV·K−1), with PPy-EMImFeCl4 showing the most notable increase in terms of figure of merit (ZT = 5.109 × 10−3), which was approximately 250 times that of the neat polypyrrole. This effect is also attributed to the ability of EMImFeCl4 to reduce the thermal conductivity (κ = 0.069 W·m−1·K−1). [ABSTRACT FROM AUTHOR]
ISSN:03615235
DOI:10.1007/s11664-026-12764-7