杂化卤化铅光致变色铁弹体  

Photochromic ferroelasticity observed in hybrid lead halide through effective structural regulation

作　　者：特日格勒 贾强强 郭强 张毅 付大伟 Gele Teri;Qiang-Qiang Jia;Qiang Guo;Yi Zhang;Da-Wei Fu(Institute for Science and Applications of Molecular Ferroelectrics,Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Zhejiang Normal University,Jinhua 321004,China;Ordered Matter Science Research Center,Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics,Southeast University,Nanjing 211189,China)

机构地区：[1]Institute for Science and Applications of Molecular Ferroelectrics,Key Laboratory of the Ministry of Education for Advanced Catalysis Materials,Zhejiang Normal University,Jinhua 321004,China [2]Ordered Matter Science Research Center,Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics,Southeast University,Nanjing 211189,China

出　　处：《Science China Materials》2023年第9期3687-3695,共9页中国科学（材料科学（英文版）

基　　金：financially supported by Zhejiang Normal University;the National Natural Science Foundation of China (21991141);the Natural Science Foundation of Zhejiang Province (LZ20B010001)。

摘　　要：多功能材料是当前交叉研究的热点,有机-无机杂化材料因其结构多样性为构筑多功能材料提供了极大的可能性.多功能铁弹材料在机械开关、形状记忆以及能量转换等领域具有广泛的应用前景,特别是具备光学电学协同特征的铁弹材料是新器件应用研究的亮点.尽管目前报道了大量具有光致发光、热致变色等优异性质的铁弹材料,但尚未破解将铁弹性和光致变色协同这一难题.本文通过功能阳离子与卤化铅骨架构筑了具有光致变色效应的铁弹体,(3-hydroxypyrrolidinium)_(4)Pb_(3)Br_(10),并通过分子间插入氢键的策略有效提高了材料的相变温度.该材料还可同时实现两步介电响应,具有可切换铁弹畴和光致变色的多通道物理特性,这对显示传感器件的探索研究非常有帮助.总之,本研究为多功能物理响应材料的合成提供了多学科交叉研究策略和思路.Ferroelastics,the mechanism analogous to ferroelectrics and ferromagnets,have attracted comprehensive attention owing to the prominent spontaneous strain characteristics.However,the contingency of symmetry changes during the phase transition brings a great challenge to the construction of ferroelastic materials.Currently,most of the ferroelastics are accompanied by various physical properties,such as,photoluminescence and thermochromism.There are few reports of ferroelastics with a photochromic effect.Here,we have successfully designed two hybrid metal halide materials,(pyrrolidinium)PbBr3(M-1)and(3-hydroxypyrrolidinium)_(4)Pb_(3)Br_(10)(M-2),both of which possess a two-step dielectric response.The organic-inorganic hybrid materials with structural adjustability provide a good design platform and great possibilities.Meanwhile,the strategy of introducing intermolecular H-bonds increases the phase transition temperature by about 90 K,and also achieves dimensional regulation(3D→2D).Exhilaratingly,the second phase transition of M-2 belongs to the 2/mF1-type ferroelastic phase transition according to the Aizu rules,and the ferroelastic domains are observed by a polarizing microscope,which strongly proves the ferroelasticity.Furthermore,we find that these compounds possess a photochromic effect.Especially,the photochromic phenomenon(from milky white to beige)of M-2 is more fascinating,making it a potential candidate for sensors and display devices.The key properties are well-verified through theoretical calculations with high consistency.In short,this photochromic ferroelastic might be a potential candidate in the fields of mechanical switches,shape memory and energy conversion.

关 键 词：多功能材料 光致变色 机械开关 传感器件 介电响应 铁弹畴 能量转换 铁弹性 

分 类 号：TB34[一般工业技术—材料科学与工程]