PEDOT∶PSS及其纳米复合材料热电性质的研究进展

Research progress in thermoelectric properties of PEDOT∶PSS and its nanocomposites

近年来,随着能源危机的加剧,可以将热能与电能进行直接转换的热电材料得到了广泛的关注。在众多热电材料体系中,有机无机纳米复合热电材料具有独特优势。相比于无机材料,有机材料成本低、质量轻、机械柔韧性好、热导率较低。添加不同类型的添加材料构成纳米复合材料后,额外引入的声子-界面散射能进一步降低热导率,同时有机无机材料能带不匹配引起的载流子筛选效应进一步提升塞贝克(Seebeck)系数。因此,目前大量工作证明有机无机纳米复合热电材料有潜力获得高的热电优值(Figure of merit,ZT),在微型热电制冷器件、柔性可穿戴发电设备、温度传感器等领域均具有光明的应用前景。本文聚焦聚(3,4-乙烯二氧噻吩)∶聚(苯乙烯磺酸盐)(PEDOT∶PSS)热电材料及以其为基底构成的纳米复合材料热电性能的研究工作,综述了提升PEDOT∶PSS热电性能的物理方法、化学试剂改性法等。进一步重点讨论了加入不同类型的无机填料的PEDOT∶PSS基纳米复合材料热电性质的研究进展,并揭示了其热电性能提升的内在机制。

In recent years,with the aggravation of energy crisis,thermoelectric materials which can directly convert heat energy to electric energy have attracted much attention.Among many types of thermoelectric materials,organic-inorganic hybrid nanocomposites have unique advantages.Compared with inorganic materials,organic materials have the advantages of low cost,light weight,good mechanical flexibility and low thermal conductivity.Once different types of addictions are introduced to form nanocomposites,additional phonon-interface scattering can further reduce the thermal conductivity.Moreover,carrier filtering effect induced by band mismatch between organic and inorganic materials enhances Seebeck coefficient.Therefore,abundance works have proved that organic-inorganic hybrid nanocomposites have the potential to obtain promoted thermoelectric figure of merit(ZT),and have bright application prospects in micro-thermoelectric refrigeration devices,flexible wearable power generation devices,temperature sensors and other fields.This paper focuses on the thermoelectric properties of poly(3,4-ethylenedioxythiophene)∶poly(styrene sulfonate)(PEDOT∶PSS)thermoelectric materials and its nanocomposites.The physical methods and chemical reagent modification methods to improve the thermoelectric properties of PEDOT∶PSS are reviewed.The research progress of the thermoelectric properties of PEDOT∶PSS based nanocomposites with different types of inorganic fillers is further discussed.The inherent mechanisms of the improvement of thermoelectric properties of PEDOT∶PSS based nanocomposites are also revealed in detail.