论文标题
聚（3,4-乙二醇二苯乙烯）的纳米级的热和电平面电导率：三氟甲磺酸盐薄膜
Thermal and electrical cross-plane conductivity at the nanoscale in poly(3,4-ethylenedioxythiophene):trifuoromethanesulfonate thin films
论文作者
论文摘要
在这项研究中，研究了用三氟甲磺酸盐（OTF）稳定的导电聚合物（聚（3,4-乙二基二苯乙烯）的薄膜中的跨平面电和热传输。我们通过导电原子力显微镜（C-AFM）探索它们的电性能，该特性揭示了高电导性纳米域的存在。通过空点扫描热显微镜（NP-STHM）测量跨平面方向的热导率：PEDOT：OTF确实表明了对热传输的不可忽略的电子贡献。我们进一步研究了通过处理后电导率与热导率之间的相关性：化学还原（DEOPING），目的是降低电荷载体浓度，从而使电导率和酸处理（过度兴奋剂）增加后者。从我们的测量值中，我们发现振动热电导率为0.34（+/- 0.04）WM-1 K-1。从线性依赖性或热导率与电子电导率（Widemann-Franz定律）的电子贡献，我们推断出洛伦兹（Lorenz）的数量是经典的Sommerfeld值6倍，如许多平面内热运输的有机材料中所观察到的。采用最近提出的分子Widemann-Franz定律，我们推断出0.53（+/- 0.06）EV的重组能量。
Cross-plane electrical and thermal transport in thin films of a conducting polymer (poly(3,4-ethylenedioxythiophene), PEDOT) stabilized with trifluoromethanesulfonate (OTf) is investigated in this study. We explore their electrical properties by conductive atomic force microscopy (C-AFM), which reveals the presence of highly conductive nano-domains. Thermal conductivity in cross-plane direction is measured with Null-Point scanning thermal microscopy (NP-SThM): PEDOT:OTf indeed demonstrates non-negligible electronic contribution to the thermal transport. We further investigate the correlation between electrical and thermal conductivity by applying posttreatment: chemical reduction (de-doping) for the purpose of lowering charge carrier concentration and hence, electrical conductivity and acid treatment (over-doping) to increase the latter. From our measurements, we find a vibrational thermal conductivity of 0.34 (+/- 0.04) Wm-1 K-1. From the linear dependence or the electronic contribution of thermal conductivity vs. the electronic conductivity (Widemann-Franz law), we infer a Lorenz number 6 times larger than the classical Sommerfeld value as also observed in many organic materials for in-plane thermal transport. Applying the recently proposed molecular Widemann-Franz law, we deduced a reorganization energy of 0.53 (+/- 0.06) eV.
