2D free-standing ultra-large ferromagnetic nanosheets via a topotactic transformation strategy

作     者：Haofeng Sun Minghao Wang Wenjie Li Yang Liu Xinyu Sun Wenjie Wang Yuqiao Guo Yi Xie Changzheng Wu 

作者机构：Key Laboratory of Precision and Intelligent ChemistryUniversity of Science&Technology of ChinaHefei 230026China National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230029China 

出 版 物：《Science China Chemistry》 (中国科学(化学英文版))

年 卷 期：2025年第68卷第4期

页      面：1337-1344页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：supported by the CAS Project for Young Scientists in Basic Research(YSBR-070) the National Natural Science Foundation of China(21925110,22321001,U2032161,12147105,22201273,22205226) the National Key Research and Development Program of China(2022YFA1203601,2022YFA1203601,2022YFA1203602) the USTC Research Funds of the Double First-Class Initiative(YD2060002004,WK2060000047) the University Synergy Innovation Program of Anhui Province(GXXT-2022-006) the support from the Major/Innovative Program of Development Foundation of Hefei Center for Physical Science and Technology 

主　　题：two-dimensional non-layered material free-standing room-temperature ferromagnetism anisotropic 

摘      要：Considerable progress has been made in synthesizing two-dimensional(2D)materials by exfoliating layered ***;for tremendous non-layered inorganic materials;especially magnet solids;usually with closely packed bulk phases by strong chemical bonds;it is challenging to obtain their high-quality 2D ***;we highlighted a new structure of free-standing ferromagnetic nanosheets featuring(111)*** magnet;Fe_(3)O_(4);its inversed spinel crystalline has limited abilities to exfoliate into 2D forms and rarely exists as free-standing nanosheets owing to aggregation induced by magnetic *** realized a breakthrough in achieving free-standing ferromagnetic nanosheets with dramatically surpassing size limitations via topotactic conversion from layered *** Fe_(3)O_(4) nanosheets exhibited a maximum width of 60μm while onl y~4 nm thick;prominently exposing(111)facets.2D Fe_(3)O_(4) behaved anisotropic magnetism;which displayed a 4.6 emu g^(-1) moment(H=500 Oe)in the(111)plane but 2.1 emu g^(-1)out of the(111)plane;indicating a(111)in-plane easy *** anticipated our topotactic conversion strategy would inspire the creation of 2D non-layered materials and enrich the 2D materials family.