Biomimetic Approach to Facilitate the High Filler Content in Free-Standing and Flexible Thermoelectric Polymer Composite Films Based on PVDF and Ag2Se Nanowires,ACS Applied Materials & Interfaces

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Biomimetic Approach to Facilitate the High Filler Content in Free-Standing and Flexible Thermoelectric Polymer Composite Films Based on PVDF and Ag2Se Nanowires
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-11-07 , DOI: 10.1021/acsami.0c15414
Hongju Zhou ₁ , Zhenjie Zhang ₁ , Chengxiao Sun ₁ , Hua Deng ₁ , Qiang Fu ₁

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A high filler content is often needed in polymer composite-based thermoelectric (TE) films to improve their performance. Nevertheless, this often leads to poor processability and poor mechanical performance. Herein, a biomimetic approach is adopted to facilitate the filler content up to 90.5 wt % in free-standing and flexible n-type PVDF/Ag₂Se TE films, where PVDF dendricolloids are a solution mixed with Ag₂Se nanowires (NWs), followed by filtration. These soft dendric nanoparticles within PVDF dendricolloids have high adhesivity and strong network-building ability, which allows the formation of “grapevine-grape”-like networks with soft dendritic particles and inorganic TE fillers as “grapevine” and “manicure finger grapes”, respectively. The maximum power factor of 189.02 μW m^–1 K^–2 is achieved for a PVDF/Ag₂Se mass ratio of 1:9.5 at 300 K. Meanwhile, excellent flexibility with only 15.8% decrease in electrical conductivity after 1000 bending cycles was observed. These properties at such a high filler content are attributed to the long-range grapevine-like network of soft PVDF dendritic particles and entanglement between numerous Ag₂Se NWs. This work carves a path to fabricate high-performance free-standing flexible n-type TE composite films as well as other functional polymer composites requiring high inorganic filler loading.

中文翻译：

仿生方法促进基于PVDF和Ag ₂ Se纳米线的自由式和柔性热电聚合物复合膜中高填充含量

在基于聚合物复合材料的热电（TE）膜中通常需要高填料含量以改善其性能。然而，这通常导致差的可加工性和差的机械性能。在本文中，采用仿生方法来使自支撑且柔性的n型PVDF / Ag ₂ Se TE薄膜中的填料含量达到90.5 wt％，其中PVDF树状胶体是与Ag ₂ Se纳米线（NWs）混合的溶液，然后过滤。PVDF树状胶体中的这些柔软的树状纳米粒子具有高粘附性和强大的网络构建能力，从而可以分别形成带有类似树突状颗粒和无机TE填充物的“葡萄树-葡萄”状网络，分别作为“葡萄树”和“修指甲的指形葡萄”。。最大功率因数189.02μWm在300 K下，PVDF / Ag ₂ Se质量比为1：9.5时，可达到^–1 K ^–2。同时，观察到出色的柔韧性，在1000次弯曲循环后，电导率仅降低了15.8％。在如此高的填料含量下，这些性能归因于柔软的PVDF树突状颗粒的长距离葡萄状网络以及众多Ag ₂ Se纳米线之间的缠结。这项工作为制造高性能的独立式柔性n型TE复合膜以及需要高无机填料含量的其他功能性聚合物复合材料开辟了道路。

更新日期：2020-11-18

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