Trade-off of mechanical and electrical properties in stretchable P3HT/PDMS blending films driven by interpenetrating double networks formation
Trade-off of mechanical and electrical properties in stretchable P3HT/PDMS blending films driven by interpenetrating double networks formation
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DOI：
10.1063/1.5145180
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发表时间：
2020-03
期刊：
影响因子：
1.6
通讯作者：
Jingnan Zhao;Lei Sun;Zhaoyang Chu;Tian Li;Fapei Zhang;Liangbin Li;Wenhua Zhang
中科院分区：
文献类型：
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作者：
Jingnan Zhao;Lei Sun;Zhaoyang Chu;Tian Li;Fapei Zhang;Liangbin Li;Wenhua Zhang
共轭聚合物的电性能和机械性能的平衡对于在可穿戴和可植入设备中扩展应用极其重要。共轭聚合物与有机弹性体共混是改善材料变形性能的一种简单易行的方法。在这项工作中，聚（3-己基噻吩）（P3 HT）纳米线共混聚二甲基硅氧烷（PDMS）弹性体通过旋涂在两种基板上，SiO2/Si和PDMS。对P3 HT/PDMS共混薄膜的有机场效应晶体管进行了测试，以评价薄膜的电学性能。的相分离结构，表面形貌，和拉伸下的变形，其特征在于通过X射线光电子能谱，原子力显微镜，光学显微镜，分别。在SiO2/Si上形成了P3 HT纳米线凝聚在界面处的层状结构，而在PDMS衬底上形成了互穿的双网络结构。P3 HT/PDMS共混膜的双重网络结构不仅使P3 HT含量在较宽范围内（≥5 wt. %），而且相对于净P3 HT膜的拉伸性能大大增强。这种由基底极性选择引起的双网络结构可能为制备具有平衡力学和电学行为的柔性共混膜提供了一条有效途径。
The balance of electrical and mechanical properties of conjugated polymers is extremely significant toward extending applications in wearable and implantable devices. Blending conjugated polymers with organic elastomers is a straightforward and facile way to improve the deformability of the materials. In this work, poly(3-hexylthiophene) (P3HT) nanowires were blended with a polydimethylsiloxane (PDMS) elastomer via spin-coating on two kinds of substrates, SiO2/Si and PDMS. Organic field-effect transistors based on P3HT/PDMS blending films were tested to evaluate the electronic properties of the films. The phase separation structures, surface morphologies, and the deformation under stretching were characterized by x-ray photoelectron spectroscopy, atomic force microscopy, and optical microscopy, respectively. A stratified structure with P3HT nanowires condensed at the interface formed on SiO2/Si, while an interpenetrating double networks structure yielded on the PDMS substrate. The double networks structure affords P3HT/PDMS blending films not only similar field-effect mobility in a wide range of P3HT content (≥5 wt. %) but also much enhanced stretching performance with respect to the net P3HT film. This double networks structure induced by polarity selection of the substrate might provide an efficient route to prepare flexible blending films with balanced mechanical and electrical behaviors.