文献类型：期刊文献

英文题名：From Na2Cl to CaCl: Progress in the 2D Crystals of Unconventional Stoichiometries in Ambient Conditions

作者：Wu, Mengjiao[1];Lei, Xiaoling[1];Fang, Haiping[1,2]

机构：[1]East China Univ Sci & Technol, Sch Phys, Shanghai Key Lab Atom Control & Applicat Inorgan 2, Shanghai 200237, Peoples R China;[2]Zhejiang Univ, Sch Phys, Hangzhou 310027, Peoples R China

年份：2025

卷号：6

期号：3

外文期刊名：SOLIDS

收录：WOS:【ESCI(收录号:WOS:001580921900001)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 12435001), the Natural Science Foundation of Shanghai, China (No. 23JC1401400), the Fundamental Research Funds for the Central Universities of East China University of Science.

语种：英文

外文关键词：2D crystals; graphene; unconventional stoichiometries; room-temperature ferromagnetism; piezoelectricity; hydrated cation-pi interactions

摘要：Two-dimensional (2D) crystals which present unconventional stoichiometries on graphene surfaces in ambient conditions, such as Na2Cl, Na3Cl, and CaCl, have attracted significant attention in recent years due to their electronic structures and abnormal cation-anion ratios, which differ from those of conventional three-dimensional crystals. This unconventional crystallization is attributed to the cation-pi interaction between ions and the pi-conjugated system of the graphene surface. Consequently, their physical and chemical properties-including their electrical, optical, magnetic, and mechanical characteristics-often differ markedly from those of conventional crystals. This review summarizes the recent progress made in the fabrication and analysis of the structures, distinctive features, and applications of these 2D unconventional stoichiometry crystals on graphene surfaces in ambient conditions. Their special properties, including their piezoelectricity, metallicity, heterojunction, and room-temperature ferromagnetism, are given particularly close attention. Finally, some significant prospects and further developments in this exciting interdisciplinary field are proposed.