Rathi Vaishali, Singh Kamal, Parmar K P S, Brajpuriya Ranjeet K, Kumar Ashish
Department of Chemistry, Applied Science Cluster, U.P.E.S. Bidholi Dehradun India
Department of Physics, Applied Science Cluster, U.P.E.S. Bidholi Dehradun India
RSC Adv. 2024 Nov 1;14(47):34883-34892. doi: 10.1039/d4ra06184e. eCollection 2024 Oct 29.
We report a significant enhancement in the thermoelectric power of PEDOT by fabricating a novel ternary composite film by incorporating BiTe and rGO. A series of five samples of PEDOT:PSS/BiTe/rGO ternary composite films were synthesized using a spin coating method and having different weight% (0.0, 0.1, 0.2, 0.3 wt%) of rGO in PEDOT:PSS/0.4 wt% BiTe mixture along with pure PEDOT:PSS sample. The Seebeck coefficient, electrical conductivity, and power factor increased in composite films compared to pure PEDOT:PSS films. Incorporating rGO enhanced charge carrier mobility because of its highly conductive network, whereas BiTe provided higher Seebeck coefficients owing to its inherent thermoelectric properties. PEDOT:PSS offered mechanical flexibility and a conductive matrix, facilitating effective phonon scattering and inherently lower thermal conductivity. The sample (PEDOT:PSS/0.4 wt% BiTe/0.1 rGO wt%) demonstrated the highest electrical conductivity of 1522.4 S cm, a Seebeck coefficient of (+) 24.7 μV K, and a power factor of 93.16 μW m K at room temperature. These values represent a twelve-fold increase compared to pristine PEDOT films. A flexible, printable thermoelectric generator (TEG) was also demonstrated on polyimide substrate using inks prepared from p-type PEDOT:PSS/BiTe/rGO and n-type PVDF/Ni NWs. The paper TEG achieved a maximum power output of 242.1 nW, with an output voltage of 9.84 mV and an output current of 49.21 μA at a temperature difference (Δ) of 35 K. XRD, Raman spectroscopy SEM, and XPS techniques were used to understand the underlying mechanism. This novel PEDOT:PSS/BiTe/rGO ternary composite film significantly outperforms previously reported organic thermoelectric materials. The results indicate that the combined effect of PEDOT:PSS, BiTe, and rGO greatly enhances thermoelectric performance, offering a promising and efficient route for the application of PEDOT in advanced thermoelectric conversion processes.
我们报道了通过将BiTe和rGO掺入制备新型三元复合薄膜，显著提高了PEDOT的热电功率。采用旋涂法合成了一系列五个PEDOT:PSS/BiTe/rGO三元复合薄膜样品，在PEDOT:PSS/0.4 wt% BiTe混合物中rGO的重量百分比不同（0.0、0.1、0.2、0.3 wt%），同时还有纯PEDOT:PSS样品。与纯PEDOT:PSS薄膜相比，复合薄膜的塞贝克系数、电导率和功率因数均有所提高。由于rGO具有高导电网络，掺入rGO可提高载流子迁移率，而BiTe因其固有的热电性能提供了更高的塞贝克系数。PEDOT:PSS提供了机械柔韧性和导电基质，促进了有效的声子散射并固有地降低了热导率。样品（PEDOT:PSS/0.4 wt% BiTe/0.1 rGO wt%）在室温下表现出最高电导率1522.4 S/cm、塞贝克系数（+）24.7 μV/K和功率因数93.16 μW/(m²K²)。这些值与原始PEDOT薄膜相比提高了十二倍。还使用由p型PEDOT:PSS/BiTe/rGO和n型PVDF/Ni NWs制备的油墨在聚酰亚胺基板上展示了一种柔性、可印刷的热电发电机（TEG）。该纸质TEG在35 K的温差（Δ）下实现了242.1 nW的最大功率输出，输出电压为9.84 mV，输出电流为49.21 μA。使用XRD、拉曼光谱、SEM和XPS技术来理解其潜在机制。这种新型PEDOT:PSS/BiTe/rGO三元复合薄膜显著优于先前报道的有机热电材料。结果表明，PEDOT:PSS、BiTe和rGO的综合作用大大提高了热电性能，为PEDOT在先进热电转换过程中的应用提供了一条有前景且高效的途径。
