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 China National Synchrotron Radiation LaboratoryUniversity of Science and Technology of China 

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

年 卷 期：2025年

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 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 

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,Fe3O4,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 *** Fe3O4nanosheets exhibited a maximum width of 60μm while only～4 nm thick,prominently exposing （111） facets.2D Fe3O4behaved anisotropic magnetism,which displayed a 4.6 emu g-1moment（H=500 Oe） in the （111） plane but 2.1 emu g-1out 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.