Two-dimensional(2D)rare-earth oxides(REOs)are a large family of materials with various intriguing applications and precise facet control is essential for investigating new properties in the 2D limit.However,a bottleneck remains with regard to obtaining their 2D single crystals with specific facets because of the intrinsic non-layered structure and disparate thermodynamic stability of different facets.Herein,for the first time,we achieve the synthesis of a wide variety of high-quality 2D REO single crystals with tailorable facets via designing a hard-soft-acid-base couple for controlling the 2D nucleation of the predetermined facets and adjusting the growth mode and direction of crystals.Also,the facet-related magnetic properties of 2D REO single crystals were revealed.Our approach provides a foundation for further exploring other facet-dependent properties and various applications of 2D REO,as well as inspiration for the precise growth of other non-layered 2D materials.

Linyang Li;Fangyun Lu;Wenqi Xiong;Yu Ding;Yangyi Lu;Yao Xiao;Xin Tong;Yao Wang;Shuangfeng Jia;Jianbo Wang;Rafael G.Mendes;Mark H.Rümmeli;Shengjun Yuan;Mengqi Zeng;Lei Fu

College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China;Key Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education and School of Physics and Technology,Wuhan University,Wuhan 430072,China;The Institute for Advanced Studies,Wuhan University,Wuhan 430072,China;College of Physics,Optoelectronics and Energy,and Collaborative Innovation Center of Suzhou Nano Science and Technology,Soochow University,Suzhou 215006,China;Institute for Complex Materials,FW Dresden,Dresden 01069,Germany;Centre of Polymer and Carbon Materials,Polish Academy of Sciences,Zabrze 41-819,Poland;Institute of Environmental Technology,VSB-Technical University of Ostrava,Ostrava 708 33,Czech Republic

国家科学评论（英文版）

[1]Linyang Li;Fangyun Lu;Wenqi Xiong;Yu Ding;Yangyi Lu;Yao Xiao;Xin Tong;Yao Wang;Shuangfeng Jia;Jianbo Wang;Rafael G.Mendes;Mark H.Rümmeli;Shengjun Yuan;Mengqi Zeng;Lei Fu-.General synthesis of 2D rare-earth oxide single crystals with tailorable facets)[J].国家科学评论（英文版）,2022(05):17-24

REOs

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