Na_(0.015)Sn_(0.985)Se/PEDOT∶PSS块体复合热电材料的制备与性能研究

Preparation and Performance Study on Na_(0.015)Sn_(0.985)Se/PEDOT∶PSS Bulk Thermoelectric Composites

PEDOT∶PSS作为非常有潜力的有机热电材料,具有良好的加工性和成膜性、较高的电导率以及低热导率等优点,但是相对于无机材料,PEDOT∶PSS的ZT值仍较低。目前关于PEDOT∶PSS的研究大都集中在薄膜材料上,而热电材料的主流应用主要集中在块体材料上,因此对PEDOT∶PSS块体热电材料的研究具有重要意义。介绍了一种块体PEDOT∶PSS热电材料的制备方法,采用有机极性溶剂DMSO对PEDOT∶PSS进行掺杂改性,并与无机材料Na_(0.015)Sn_(0.985)Se复合制得高性能Na_(0.015)Sn_(0.985)Se/PEDOT∶PSS块体复合热电材料。结果表明,DMSO可以极大的提高材料的电导率;与Na_(0.015)Sn_(0.985)Se复合后虽然电导率有所下降,但同时伴随着热导率的降低以及Seebeck系数的增大,最终当复合量为10wt%时ZT值在300 K附近达到2.65×10-3,相比于基体提高了约3倍。

PEDOT ： PSS is a promising organic thermoelectric material due to its good processability, film forming property, high electronical conductivity and low thermal conductivity. However, the ZT value of PEDOT ： PSS is still much lower than that of inorganic materials. Currently, the studies on PEODT： PSS mostly focus on thin film materials, while the mainstream applications of thermoelectric materials are mainly concentrated on the bulk materials. Accordingly, it is of great significance for studying the bulk thermoelectric materials of PEDOT ： PSS. The method to prepare PEDOT ： PSS bulk thermoelectric material was introduced. PEDOT ： PSS was doped with the organic polar solvent DMSO, and composited with the inorganic material Na0.015 Sn0.985 Se to prepare high-performance PEDOT ：PSS bulk thermoelectric material. The results show that DMSO can greatly improve the electrical conductivity of materials. The electrical conductivity decreases after composited, but the thermal conductivity decreases and seebeck coefficient increases at the same time. Finally, the ZT value of 2.65 × 10 ^-3 is achieve at 300 K with the Na0.015Sn0.985Se content of 10wt%, which is 3 times higher than the PEDOT ： PSS matrix.