An inorganic liquid crystalline dispersion with 2D ferroelectric moieties  

作　　者：Ziyang Huang Zehao Zhang Rongjie Zhang Baofu Ding Liu Yang Keyou Wu Youan Xu Gaokuo Zhong Chuanlai Ren Jiarong Liu Yugan Hao Menghao Wu Teng Ma Bilu Liu 

机构地区：[1]Shenzhen Graphene Centre,Shenzhen Key Laboratory of Advanced Layered Materials for Value-added Applications,Tsinghua−Berkeley Shenzhen Institute and Institute of Materials Research,Tsinghua Shenzhen International Graduate School,Tsinghua University,Shenzhen 518055,China [2]Institute of Technology for Carbon Neutrality,Faculty of Materials Science and Engineering,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China [3]School of Physics and Institute for Quantum Science and Engineering,School of Chemistry and Institute of Theoretical Chemistry,Huazhong University of Science and Technology,Wuhan 430074,China [4]Xi’an Research Institute of High Technology,Xi’an 710025,China [5]Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China [6]Department of Applied Physics,Hong Kong Polytechnic University,Hong Kong,China

出　　处：《National Science Review》2024年第5期247-256,共10页国家科学评论（英文版）

基　　金：supported by the National Natural Science Foundation of China(51920105002,52125309,52273311,51991343,51991340 and 52188101);the Guangdong Innovative and Entrepreneurial Research Team Program(2017ZT07C341);the Innovation Team Project of Department of Education of Guangdong Province(2023KCXTD051);the Shenzhen Science and Technology Program(ZDSYS20230626091100001);the Shenzhen Basic Research Project(WDZC20200819095319002,JCYJ20190809180605522,JCYJ20220818100806014 and WDZC20231128154552002);the Tsinghua Shenzhen International Graduate School,Shenzhen Pengrui Young Faculty Program of Shenzhen Pengrui Foundation(SZPR2023002).

摘　　要：Electro-optical effect-based liquid crystal devices have been extensively used in optical modulation techniques,in which the Kerr coefficient reflects the sensitivity of the liquid crystals and determines the strength of the device’s operational electric field.The Peterlin–Stuart theory and the O’Konski model jointly indicate that a giant Kerr coefficient could be obtained in a material with both a large geometrical anisotropy and an intrinsic polarization,but such a material is not yet reported.Here we reveal a ferroelectric effect in a monolayer two-dimensional mineral vermiculite.A large geometrical anisotropy factor and a large inherent electric dipole together raise the record value of Kerr coefficient by an order of magnitude,till 3.0×10^(−4) mV^(−2).This finding enables an ultra-low operational electric field of 10^(2)–10^(4) Vm^(−1) and the fabrication of electro-optical devices with an inch-level electrode separation,which has not previously been practical.Because of its high ultraviolet stability(decay<1%under ultraviolet exposure for 1000 hours),large-scale production,and energy efficiency,prototypical displayable billboards have been fabricated for outdoor interactive scenes.This work provides new insights for both liquid crystal optics and two-dimensional ferroelectrics.

关 键 词：2D materials layered minerals VERMICULITE FERROELECTRIC inorganic liquid crystal Kerr coefficient 

分 类 号：TN23[电子电信—物理电子学] O753.2[理学—晶体学]