Barman Shubhankar, Bandyopadhyay Supriya, Ghosh Anupam, Das Surajit, Mondal Tathagata, Datta Ayan, Ghosh Suhrit, Datta Anuja
School of Applied and Interdisciplinary Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata-700032, India.
School of Chemical Sciences, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata-700032, India.
Chem Commun (Camb). 2022 Sep 20;58(75):10508-10511. doi: 10.1039/d2cc02506j.
This communication reports synergistic H-bonding and charge-transfer (CT) interaction-promoted alternating supramolecular copolymerization of amide-functionalized pyrene (Py) and naphthalene-diimide (NDI) building blocks and the emergence of ferroelectricity with saturation polarization ∼3.2 μC cm, Curie temperature ∼304 K, and coercive field ∼8.5 kV cm at 100 Hz. The Py or NDI molecules on their own do not exhibit any ferroelectric hysteresis, indicating an essential role of both CT-interaction and H-bonding in ferroelectricity. Computational studies provide insight into the origin of the polarization and the importance of the NDI/Py ratio. This study, showing room temperature ferroelectricity in purely organic systems, is of high relevance for flexible electronics and sensors. It opens up new opportunities for soft FE-materials with ample scope for further structural optimization.
本通讯报道了通过协同氢键和电荷转移（CT）相互作用促进的酰胺功能化芘（Py）和萘二亚胺（NDI）结构单元的交替超分子共聚，以及在100 Hz时出现的铁电性，其饱和极化强度约为3.2 μC/cm²，居里温度约为304 K，矫顽场约为8.5 kV/cm。单独的Py或NDI分子不表现出任何铁电滞回现象，这表明CT相互作用和氢键在铁电性中都起着至关重要的作用。计算研究深入了解了极化的起源以及NDI/Py比例的重要性。这项在纯有机体系中展示室温铁电性的研究，对柔性电子学和传感器具有高度相关性。它为软铁电材料开辟了新的机会，具有进一步结构优化的广阔空间。
