Almasoudi M, Salah Numan, Alshahrie Ahmed, Saeed Abdu, Aljaghtham Mutabe, Zoromba M Sh, Abdel-Aziz M H, Koumoto Kunihito
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Department of Physics, Al-Qunfudah University College, Umm Al-Qura University, Makkah 21955, Saudi Arabia.
Nanomaterials (Basel). 2022 Jul 27;12(15):2582. doi: 10.3390/nano12152582.
Polypyrrole (PPy) is a conducting polymer with attractive thermoelectric (TE) properties. It is simple to fabricate and modify its morphology for enhanced electrical conductivity. However, such improvement is still limited to considerably enhancing TE performance. In this case, a single-wall carbon nanotube (SWCNT), which has ultrathin diameters and exhibits semi-metallic electrical conductivity, might be a proper candidate to be combined with PPy as a core shell one-dimensional (1D) nanocomposite for higher TE power generation. In this work, core shell nanocomposites based on SWCNT/PPy were fabricated. Various amounts of pyrrole (Py), which are monomer sources for PPy, were coated on SWCNT, along with methyl orange (MO) as a surfactant and ferric chloride as an initiator. The optimum value of Py for maximum TE performance was determined. The results showed that the SWCNT acted as a core template to direct the self-assembly of PPy and also to further enhance TE performance. The TE power factor, , and figure of merit, zT, values of the pure PPy were initially recorded as ~1 µW/mK and 0.0011, respectively. These values were greatly increased to 360 µW/mK and 0.09 for the optimized core shell nanocomposite sample. The TE power generation characteristics of the fabricated single-leg module of the optimized sample were also investigated and confirmed these findings. This enhancement was attributed to the uniform coating and good interaction between PPy polymer chains and walls of the SWCNT through π-π stacking. The significant enhancement in the TE performance of SWCNT/PPy nanocomposite is found to be superior compared to those reported in similar composites, which indicates that this nanocomposite is a suitable and scalable TE material for TE power generation.
聚吡咯（PPy）是一种具有吸引人的热电（TE）性能的导电聚合物。它易于制备且可对其形态进行改性以提高电导率。然而，这种改进仍然局限于显著提高TE性能。在这种情况下，具有超薄直径且表现出半金属导电性的单壁碳纳米管（SWCNT）可能是与PPy结合形成核壳一维（1D）纳米复合材料以实现更高TE发电的合适候选材料。在这项工作中，制备了基于SWCNT/PPy的核壳纳米复合材料。将各种量的吡咯（Py，PPy的单体来源）与作为表面活性剂的甲基橙（MO）和作为引发剂的氯化铁一起涂覆在SWCNT上。确定了实现最大TE性能的Py的最佳值。结果表明，SWCNT充当核模板以指导PPy的自组装并进一步提高TE性能。纯PPy的TE功率因子和优值zT值最初分别记录为~1 μW/mK和0.0011。对于优化的核壳纳米复合材料样品，这些值大幅提高到360 μW/mK和0.09。还研究了优化样品制备的单腿模块的TE发电特性并证实了这些发现。这种增强归因于PPy聚合物链与SWCNT壁之间通过π-π堆积的均匀涂层和良好相互作用。发现SWCNT/PPy纳米复合材料的TE性能的显著增强优于类似复合材料中报道的增强，这表明这种纳米复合材料是用于TE发电的合适且可扩展的TE材料。
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