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Notably enhanced thermoelectric properties of lamellar polypyrrole by doping with β-naphthalene sulfonic acid

机译：掺杂β-萘磺酸显着增强层状聚吡咯的热电性能

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摘要

Polypyrrole (PPy) is a type of potential organic thermoelectric material that has attracted extensive attention in recent years. Its application is mainly limited by the relatively low intrinsic electrical conductivity and Seebeck coefficient, so it is necessary to find an effective way to improve the electrical transport properties of PPy. In this work, lamellar PPy doped with β-naphthalene sulfonic acid (β-NSA) was synthesized chemically using ferric chloride (FeCl3) as the oxidant, and the thermoelectric performance of β-NSA doped PPy was significantly enhanced. FTIR, XRD, Raman and FESEM analyses indicated that the presence of β-NSA and FeCl3 could effectively control the morphology of PPy to form a lamellar structure during the polymerization process, which improves the thermoelectric properties of PPy greatly. The highest thermoelectric figure of merit ZT, 0.62 × 10?3, was obtained with the molar ratio of monomer pyrrole (py) to β-NSA of 1.0?:?0.45 at 300 K, and was 10 times higher than that of pure PPy. Furthermore, the TGA, elastic modulus, Vickers hardness results showed that the thermal stability and mechanical properties of β-NSA doped PPy was better than that of pure PPy.
机译：聚吡咯（PPy）是一种潜在的有机热电材料，近年来受到了广泛的关注。它的应用主要受到相对较低的固有电导率和塞贝克系数的限制，因此有必要找到一种有效的方法来改善PPy的电传输性能。本文以氯化铁（FeCl 3 ）为氧化剂化学合成了掺杂有β-萘磺酸（β-NSA）的层状PPy，并具有热电性能。 β-NSA掺杂的PPy的含量显着提高。 FTIR，XRD，Raman和FESEM分析表明，β-NSA和FeCl 3 的存在可以有效地控制PPy的形貌，从而在聚合过程中形成层状结构，这大大提高了PPy的热电性能。单体吡咯（py）与β-的摩尔比为 ZT 的最高热电系数 ZT 为0.62×10 ？3 在300 K下的NSA为1.0？：？0.45，比纯PPy高10倍。此外，TGA，弹性模量，维氏硬度结果表明，β-NSA掺杂的PPy的热稳定性和力学性能均优于纯PPy。

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