Synergetic H-bonding and C-T Interaction mediated supramolecular polymers results in room temperature ferroelectrics and multiferroic materials Yadav Deepak 1 , Zinnia Mallick 2 , Dalip Saini 2 , Dipankar Mandal *2 and Raj Kumar Roy *1 1 Indian Institute of Science Education and Research Mohali, India, 2 Institute of Nano Science and Technology, India Ferroelectrics are materials with inherent polarization that can be reversed by an external electric field and show distinct pyroelectric and piezoelectric properties which offer promising applications in artificial intelligence, self- powered sensors, wearable electronics, and biomedical devices. 1 Furthermore, research interest has focused on multiferroic materials, which can exhibit multiple ferroic orders like ferroelectricity, ferromagnetism, and ferroelasticity. The cross-coupling between these order states means the ability to control magnetism via an electric field or vice versa termed as magnetoelectric effect 2 (ME) which makes them a potential candidate for various applications. Both ferroelectric and multiferroic materials developed from inorganic metals which have excellent properties in terms of either polarization or magnetization, but the presence of toxic and rare earth metals raises a great concern. In contrast, organic materials possess several highly desirable attributes for emerging technologies, including their lightweight nature, flexibility, cost-effectiveness, solution-processability, non-toxicity, and ease of integration into devices. Such limitations necessitate to development of new soft organic materials. In my presentation, I will describe the design of supramolecular polymers that will serve the purpose of ferroelectric and multiferroic at room temperature in bulk state. The supramolecular scaffold is based on the 1,3,5- benzene tricarboxamide and functionalized with electron-deficient unit naphthalene diimide (NDI) at the periphery of three arms (BTA-C 6 -NDI 3 ) which can be able to intercalate an electron-rich guest molecule through charge transfer interaction. The C-T mediated 1-D hierarchical structure results in gelation and shows ferroelectric behavior and room temperature with Tc ~ 47 °C. The piezoelectric and pyroelectric responses observed in the organogel network suggest potential applications in mechanical, and thermal energy harvesting. 3 Next, an organic radical spin (magnetic domain) was precisely incorporated through covalent linkage in a similar scaffold which shows ferroelectric and ferromagnetic phases at room temperature. Due to piezoelectric response, magnetostriction arises which facilitates the magnetoelectric coupling ME (a~220 mV/Oe cm). 4
References 1. Cao, X.; Xiong, Y.; Sun, J.; Zhu, X.; Sun, Q.; Wang, Z. L. Adv. Funct. Mater. 2021 , 31 , 2102983 2. Curie, J. Phys. Théorique Appliquée 1894 , 3 , 393–415. 3. Deepak, Z. Mallick, U. Sarkar, D. Mandal, R. K. Roy, Chem. Mater. 2023 , 35 , 3316-3328 4. Deepak, D. Saini, D. Mandal, R. K. Roy, (Manuscript under preparation)
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