文献类型：期刊文献

中文题名：Novel 2D CaCl crystals with metallicity, room-temperature ferromagnetism, heterojunction, piezoelectricity-like property and monovalent calcium ions

作者：Lei Zhang[1];Guosheng Shi[2,3];Bingquan Peng[1,4];Pengfei Gao[1];Liang Chen[5];Ni Zhong[6];Liuhua Mu[4];Lijuan Zhang[4,7];Peng Zhang[1];Lu Gou[1];Yimin Zhao[1];Shanshan Liang[4];Jie Jiang[4];Zejun Zhang[4];Hongtao Ren[1];Xiaoling Lei[3,4,7];Ruobing Yi[1,2];Yinwei Qiu[5];Yufeng Zhang[8];Xing Liu[2];Minghong Wu[2];Long Yan[4];Chungang Duan[6];Shengli Zhang[1];Haiping Fang[3,4,7]

机构：[1]MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter,School of Physics,Xi'an Jiaotong University,Xi'an 710049,China;[2]Shanghai Applied Radiation Institute,Shanghai University,Shanghai 200444,China;[3]Department of Physics,East China University of Science and Technology,Shanghai 200237,China;[4]Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;[5]Department of Optical Engineering,Zhejiang A&F University,Hangzhou 311300,China;[6]Key Laboratory of Polar Materials and Devices of Ministry of Education,East China Normal University,Shanghai 200241,China;[7]Zhangjiang Lab,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;[8]College of Physical Science and Technology,Xiamen University,Xiamen 361005,China

年份：2021

卷号：8

期号：7

起止页码：193

中文期刊名：National Science Review

外文期刊名：国家科学评论（英文版）

收录：CSTPCD;;Scopus;CSCD:【CSCD2021_2022】；PubMed;

基金：supported by the National Natural Science Foundation of China (11774279, 11974366, 11675246, 11774280and U1932123);the National Science Fund for Outstanding Young Scholars (11722548 and 11922410);the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (QYZDJ-SSW-SLH053);the Key Research Program of the Chinese Academy of Sciences (KJZD-EW-M03);the Shanghai Supercomputer Center of China and the Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase);the Fundamental Research Funds for the Central Universities;the World-Class Universities (Disciplines);the Characteristic Development Guidance Funds for the Central Universities;Young Talent Support Plan of Xi’an Jiaotong University.

语种：英文

中文关键词：2D CaCl crystals;monovalent calcium ions;room-temperature ferromagnetism;heterojunction;coexistence of piezoelectricity-like property and metallicity

摘要：Under ambient conditions,the only known valence state of calcium ions is+2,and the corresponding crystals with calcium ions are insulating and nonferromagnetic.Here,using cryo-electron microscopy,we report direct observation of two-dimensional(2D)CaCl crystals on reduced graphene oxide(rGO)membranes,in which the calcium ions are only monovalent(i.e.+1).Remarkably,metallic rather than insulating properties are displayed by those CaCl crystals.More interestingly,room-temperature ferromagnetism,graphene-CaCl heterojunction,coexistence of piezoelectricity-like property and metallicity,as well as the distinct hydrogen storage and release capability of the CaCl crystals in rGO membranes are experimentally demonstrated.We note that such CaCl crystals are obtained by simply incubating rGO membranes in salt solutions below the saturated concentration,under ambient conditions.Theoretical studies suggest that the formation of those abnormal crystals is attributed to the strong cation-πinteractions of the Ca cations with the aromatic rings in the graphene surfaces.The findings highlight the realistic potential applications of such abnormal CaCl material with unusual electronic properties in designing novel transistors and magnetic devices,hydrogen storage,catalyzers,high-performance conducting electrodes and sensors,with a size down to atomic scale.