Manzano Cristina V, Caballero-Calero Olga, Serrano Aída, Resende Pedro M, Martín-González Marisol
Instituto de Micro y Nanotecnología, IMN-CNM, CSIC (CEI UAM+CSIC), Isaac Newton 8, E-28760 Tres Cantos, Spain.
Departamento de Electrocerámica, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, E-28049 Madrid, Spain.
Nanomaterials (Basel). 2022 Dec 12;12(24):4430. doi: 10.3390/nano12244430.
Recently, polymers have been attracted great attention because of their thermoelectric materials' excellent mechanical properties, specifically their cost-effectiveness and scalability at the industrial level. In this study, the electropolymerization conditions (applied potential and deposition time) of PEDOT films were investigated to improve their thermoelectric properties. The morphology and Raman spectroscopy of the PEDOT films were analyzed according to their applied potential and deposition time. The best thermoelectric properties were found in films grown at 1.3 V for 10 min, with an electrical conductivity of 158 ± 8 S/cm, a Seebeck coefficient of 33 ± 1 µV/K, and a power factor of 17 ± 2 µW/K·m. This power factor value is three times higher than the value reported in the literature for electropolymerized PEDOT films in acetonitrile using lithium perchlorate as a counter-ion. The thermal conductivity was found to be (1.3 ± 0.3) × 10 W/m·K. The highest figure of merit obtained at room temperature was (3.9 ± 1.0) × 10 using lithium perchlorate as a counter-ion. In addition, three-dimensional (3D) PEDOT nanonetworks were electropolymerized inside 3D anodic aluminum oxide (3D AAO), obtaining lower values in their thermoelectric properties.
近年来，聚合物因其作为热电材料具有优异的机械性能，特别是在工业层面具有成本效益和可扩展性而备受关注。在本研究中，研究了聚3,4-乙撑二氧噻吩（PEDOT）薄膜的电聚合条件（施加电势和沉积时间），以改善其热电性能。根据施加电势和沉积时间对PEDOT薄膜的形态和拉曼光谱进行了分析。在1.3 V下生长10分钟的薄膜中发现了最佳热电性能，其电导率为158±8 S/cm，塞贝克系数为33±1 μV/K，功率因子为17±2 μW/K·m。该功率因子值比文献报道的以高氯酸锂作为抗衡离子在乙腈中电聚合的PEDOT薄膜的值高出三倍。发现热导率为(1.3±0.3)×10 W/m·K。使用高氯酸锂作为抗衡离子在室温下获得的最高优值为(3.9±1.0)×10。此外，在三维阳极氧化铝（3D AAO）内部电聚合了三维（3D）PEDOT纳米网络，其热电性能值较低。
