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

引用

National Science Review 2021年第7期8卷 198-204页

作者： Lei Zhang Guosheng Shi Bingquan Peng Pengfei Gao Liang Chen Ni Zhong Liuhua Mu Lijuan Zhang Peng Zhang Lu Gou Yimin Zhao Shanshan Liang Jie Jiang Zejun Zhang Hongtao Ren Xiaoling Lei Ruobing Yi Yinwei Qiu Yufeng Zhang Xing Liu Minghong Wu Long Yan Chungang Duan Shengli Zhang Haiping Fang MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of Physics Xi'an Jiaotong University Shanghai Applied Radiation Institute Shanghai University Department of Physics East China University of Science and Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences Department of Optical Engineering Zhejiang A&F University Key Laboratory of Polar Materials and Devices of Ministry of Education East China Normal University Zhangjiang Lab Shanghai Advanced Research Institute Chinese Academy of Sciences College of Physical Science and Technology Xiamen University

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(2 D) 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–Ca Cl 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 r GO membranes in salt solutions below the saturated concentration, under ambient *** 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 Ca Cl 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.

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

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