Huang Yulong, Gottfried Jennifer L, Sarkar Arpita, Zhang Gengyi, Lin Haiqing, Ren Shenqiang
Department of Mechanical and Aerospace Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA.
Weapons Sciences, US Army Combat Capabilities Development Command-Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD, 21005, USA.
Nat Commun. 2023 Aug 19;14(1):5041. doi: 10.1038/s41467-023-40825-6.
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 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/cm, 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.
分子铁电材料由通过氢键、静电力和范德华相互作用结合在一起的有机和无机离子组成。然而，尽管分子铁电体具有独特的刺激响应结构和构建单元，但离子定制的多功能性一直是其缺失的组成部分。在此，我们报道了分子离子铁电体，其呈现出室温离子电导率（6.1×10 S/cm）和铁电性的共存，这引发了离子耦合铁电特性。这种吸附了水分子的离子铁电体，由于外部刺激下离子晶格中的质子转移，其极化可在0.68至1.39 μC/cm范围内可控调节，热导率提高13%，电阻率降低86%。这些发现为分子离子铁电体向多功能性发展提供了启示。
