Proton-controlled molecular ionic ferroelectrics

Yulong Huang (), Jennifer L. Gottfried, Arpita Sarkar, Gengyi Zhang, Haiqing Lin and Shenqiang Ren ()
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Yulong Huang: University at Buffalo, The State University of New York
Jennifer L. Gottfried: Weapons Sciences, US Army Combat Capabilities Development Command-Army Research Laboratory, Aberdeen Proving Ground
Arpita Sarkar: University at Buffalo, The State University of New York
Gengyi Zhang: University at Buffalo, The State University of New York
Haiqing Lin: University at Buffalo, The State University of New York
Shenqiang Ren: University at Buffalo, The State University of New York

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Molecular ferroelectric materials consist of organic and inorganic ions held together by hydrogen bonds, electrostatic forces, and van der Waals interactions. However, ionically tailored multifunctionality in molecular ferroelectrics has been a missing component despite of their peculiar stimuli-responsive structure and building blocks. Here we report molecular ionic ferroelectrics exhibiting the coexistence of room-temperature ionic conductivity (6.1 × 10−5 S/cm) and ferroelectricity, which triggers the ionic-coupled ferroelectric properties. Such ionic ferroelectrics with the absorbed water molecules further present the controlled tunability in polarization from 0.68 to 1.39 μC/cm2, thermal conductivity by 13% and electrical resistivity by 86% due to the proton transfer in an ionic lattice under external stimuli. These findings enlighten the development of molecular ionic ferroelectrics towards multifunctionality.

Date: 2023
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DOI: 10.1038/s41467-023-40825-6

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