Thickness dependent thermal performance of a poly(3,4-ethylenedioxythiophene) thin film synthesized via an electrochemical approach.
Thickness dependent thermal performance of a poly(3,4-ethylenedioxythiophene) thin film synthesized via an electrochemical approach.
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通过电化学方法合成的聚（3,4-乙撑二氧噻吩）薄膜的厚度依赖性热性能
DOI：
10.1039/d1ra07991c
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发表时间：
2022-01-05
期刊：
影响因子：
3.9
通讯作者：
Deng T
中科院分区：
文献类型：
--
作者：
Chen S;Luan T;Di C;Lu MH;Yan XJ;Song C;Deng T
聚合物基热界面材料（TIMs）以其重量轻、成本低、耐腐蚀、易于加工等特点在热管理领域受到广泛关注。然而，固有聚合物基体的低导热系数（~ 0.2 W m−1 K−1）在很大程度上降低了聚合物基TIMs的整体热性能，即使那些含有高导热填料的TIMs也是如此。因此，提高聚合物基体的固有热导率是需要解决的关键问题之一。本文采用循环伏安法研究了聚（3,4-乙烯二氧噻吩）（PEDOT）薄膜的导热性。通过控制电化学合成过程中的循环次数，可以得到不同厚度的PEDOT薄膜。采用时域热反射（TDTR）系统对制备的PEDOT薄膜的热性能进行了评价。我们已经证明，厚度为40 nm的PEDOT薄膜的最高面外导热系数为~ 0.60 W m−1 K−1，这几乎是商用原始PEDOT:PSS薄膜的三倍。x射线衍射谱表明，电化学合成初期结晶度高的PEDOT薄膜导致热输运增强。这项工作的发现不仅为制造具有增强导热性的聚合物材料提供了机会，而且还允许人们在实际应用中调整导电聚合物的热性能。通过一步无模板电化学合成提高PEDOT薄膜的固有导热性。
Polymer-based thermal interface materials (TIMs) have attracted wide attention in the field of thermal management because of their outstanding properties including light weight, low cost, corrosion resistance and easy processing. However, the low thermal conductivity (∼0.2 W m−1 K−1) of the intrinsic polymer matrix largely degrades the overall thermal performance of polymer-based TIMs even those containing highly thermal conductive fillers. Hence, enhancing the intrinsic thermal conductivity of the polymer matrix is one of the most critical problems needed to be solved. This paper studies the thermal conductivity of poly(3,4-ethylenedioxythiophene) (PEDOT) films fabricated via cyclic voltammetry. By controlling the number of cycles in the electrochemical synthesis, different thickness of PEDOT films could be obtained. A time-domain thermoreflectance (TDTR) system was employed to evaluate the thermal performance of such as-prepared PEDOT films. We have demonstrated that a PEDOT film with thickness of 40 nm achieves the highest out-of-plane thermal conductivity of ∼0.60 W m−1 K−1, which is almost three folds the thermal conductivity of commercially available pristine PEDOT:PSS film with similar thickness. The X-ray diffraction spectrum reveals that the PEDOT thin film with high crystallinity at the initial stage of electrochemical synthesis leads to enhanced thermal transportation. The findings in this work not only offer an opportunity to fabricate polymer materials exhibiting enhanced thermal conductivity, but also allow one to adjust the thermal performance of conducting polymers in practical applications. Enhancing the intrinsic thermal conductivity of PEDOT films via a one-step template-less electrochemical synthesis.
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