Yang Yan, Zhao Guojie, Cheng Xi, Deng Hua, Fu Qiang
State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.
ACS Appl Mater Interfaces. 2021 Mar 31;13(12):14599-14611. doi: 10.1021/acsami.1c00879. Epub 2021 Mar 22.
Self-powered elastic Conductors based on thermoelectric materials with the ability to harvest energy from the living environment are considered as important for electronic devices under off-grid, maintenance-free, or unfeasible battery replacement circumstances. Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is perhaps the most well-known organic conductor. However, the application of PEDOT:PSS in flexible devices is limited by its brittleness and various unrecoverable properties under strain. Various polymer blends based on water-soluble polymers and PEDOT:PSS have been prepared. Nevertheless, they fail to illustrate good balance between electrical conductivity and mechanical performance due to various issues, including the phase morphology with PEDOT:PSS as the dispersed phase; thus, the formation of a conductive network between PEDOT:PSS is prohibited. In this study, PEDOT:PSS is incorporated into natural rubber (NR), with NR as the dispersed phase. For 10 wt % PEDOT:PSS-NR composite films doped with dimethyl sulfoxide (DMSO), the conductivity was up to 87 S/cm and the elongation at break was maintained at 490%. More importantly, self-powered temperature- and tensile strain-sensing abilities were also realized. Furthermore, it is also demonstrated that most of the unrecoverable strain and conductivity under cyclic tensile strain could be healed by water and phosphate-buffered saline (PBS) post-treatment. This work provides interesting insights for preparing healed and stretchable self-powered electronic sensors.
基于热电材料的自供电弹性导体能够从生活环境中收集能量，这对于处于离网、免维护或电池更换不可行情况下的电子设备而言至关重要。聚（3,4 - 乙撑二氧噻吩）- 聚（苯乙烯磺酸盐）（PEDOT:PSS）可能是最为人熟知的有机导体。然而，PEDOT:PSS在柔性器件中的应用受到其脆性以及在应变下各种不可恢复特性的限制。基于水溶性聚合物和PEDOT:PSS制备了各种聚合物共混物。然而，由于各种问题，包括以PEDOT:PSS为分散相的相形态，它们未能在导电性和机械性能之间展现出良好的平衡；因此，PEDOT:PSS之间导电网络的形成受到阻碍。在本研究中，PEDOT:PSS被掺入天然橡胶（NR）中，以NR作为分散相。对于掺杂二甲基亚砜（DMSO）的10 wt% PEDOT:PSS - NR复合薄膜，电导率高达87 S/cm，断裂伸长率保持在490%。更重要的是，还实现了自供电的温度和拉伸应变传感能力。此外，还证明了在循环拉伸应变下大部分不可恢复的应变和电导率可通过水和磷酸盐缓冲盐水（PBS）后处理得以恢复。这项工作为制备可恢复且可拉伸的自供电电子传感器提供了有趣的见解。
