College of Energy, Soochow Institute for Energy and Materials Innovations (SIEMIS), Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, SUDA-BGI Collaborative Innovation Center, Soochow University, Suzhou, 215006, P. R. China.
Center for Electron Microscopy State Key Laboratory, Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.
Macromol Rapid Commun. 2022 Dec;43(23):e2200542. doi: 10.1002/marc.202200542. Epub 2022 Jul 30.
2D conducting polymer thin film recently has garnered numerous interests as a means of combining the molecular aggregate ordering and promoting in-plane charge transport for large-scale/flexible organic electronics. However, it remains far from satisfactory for conducting polymer chains to achieve desirable surface topography and crystallinity due to lack of control over the precursor-involved interfacial assembly. Herein, wafer-size polyaniline (PANI) and tetra-aniline thin films are developed via a controlled interfacial synthesis with customized surface morphology and crystallinity through two typical aniline precursors selective polymerization. Two crucial competing assembly mechanisms, a) direct interfacial polymerization, b) solution polymerization and subsequent interfacial assembly, are investigated to play a vital role in determining elemental chain length and aggregate architecture. The optimal PANI thin film manifests ultraflat surface topography and unambiguous crystalline domains, which also enabling fascinating ammonia sensing capability with 31.4% ppm sensitivity, fast response time (88 s) with astonishing selectivity, repeatability, and recovery capability. The thus-demonstrated strategy with wafer-scale processing potential and flexible microdevice offers a promising route for large-scale manufacturing thin-film organic electronics.
二维导电聚合物薄膜最近引起了广泛关注，它是一种将分子聚集有序和促进面内电荷输运相结合的方法，适用于大规模/柔性有机电子学。然而，由于缺乏对涉及前体的界面组装的控制，使得导电聚合物链难以实现理想的表面形貌和结晶度。在此，通过使用两种典型的苯胺前体制备，通过控制界面合成，在晶圆级上制备了聚邻苯二胺（PANI）和四苯胺薄膜，具有定制的表面形态和结晶度。两种关键的竞争组装机制，a）直接界面聚合，b）溶液聚合和随后的界面组装，被证明在决定元素链长和聚集结构方面起着重要作用。优化后的 PANI 薄膜表现出超平整的表面形貌和明确的结晶域，同时具有令人瞩目的氨传感性能，灵敏度为 31.4%ppm，响应时间快（88s），具有惊人的选择性、重复性和恢复能力。这种具有晶圆级加工潜力和柔性微器件的策略为大规模制造薄膜有机电子学提供了一种有前途的途径。
