https://scholars.lib.ntu.edu.tw/handle/123456789/627002
標題: | Enhanced mobility preservation of polythiophenes in stretched states utilizing thienyl-ester conjugated side chain | 作者: | Yu, Ping Jui Lin, Yan Cheng Lin, Chia Yu WEN-CHANG CHEN |
關鍵字: | Conjugated polymer | Field-effect transistor | Intrinsic stretchability | poly(quaterthiophene) | Side-chain engineering | 公開日期: | 3-一月-2023 | 卷: | 264 | 來源出版物: | Polymer | 摘要: | Recently, diverse approaches to synthesizing intrinsically stretchable conjugated polymers have been presented, such as incorporating the conjugation break spacers or intermolecular interactions in conjugated backbones, resulting in a compromise in the charge carrier mobility. In this study, polythiophenes with flexible [2,2':5′,2'':5″,2‴]-quaterthiophene (QT) or rigid 2-([2,2′-bithiophen]-5-yl)thieno[3,2-b]thiophene (BTTT) backbones were engineered with ester- (E−), thienyl- (T-), and thienyl-ester-substituted (TE) side chains for an enriched amorphous content and an improved mechanical tolerance. Polythiophene with QT backbone and TE side chain (PQT-TE) represents the best mobility−stretchability properties evidenced by the polarized UV–vis absorption, grazing incidence X-ray diffraction, and surface morphological analyses. Accordingly, PQT-TE presents a higher chain conformability and crack-onset strain than QT-based polythiophene with T (PQT-T) or E (PDCBT) side chains. This improvement originated from enriched amorphous domains and enhanced backbone planarity using a biaxially extended conjugation design. PQT-TE exhibits high orthogonal mobility preservations of (64, 90)% under 60% strain parallel/perpendicular to the channel direction. Notably, PQT-TE achieves high orthogonal mobility preservations of (48, 65)% after 800 cyclic stretch−release tests under 60% strain, and these improvements are similarly observed in that of BTTT-based polythiophene (PBTTT-TE). This study demonstrates that the jointed design of the biaxial extension and ester functional groups is efficacious in improving the mobility−stretchability properties of polythiophenes. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/627002 | ISSN: | 00323861 | DOI: | 10.1016/j.polymer.2022.125575 |
顯示於: | 化學工程學系 |
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