文献类型：期刊文献

英文题名：Unexpected Piezoresistive Effect, Room-Temperature Ferromagnetism, and Thermal Stability of 2D β-CuI Crystals in Reduced Graphene Oxide Membrane

作者：Peng, Bingquan[1,2];Zhang, Quan[3];Zhang, Yueyu[1,2,4];Zhao, Yimin[3];Hou, Shengyue[1,2];Yang, Yizhou[4];Dai, Fangfang[1,2];Yi, Ruobing[3];Chen, Ruoyang[4];Wang, Jun[4];Zhang, Lei[3];Chen, Liang[5];Zhang, Shengli[3];Fang, Haiping[1,2,4]

机构：[1]Univ Chinese Acad Sci, Wenzhou Inst, Wenzhou 325000, Zhejiang, Peoples R China;[2]Oujiang Lab, Wenzhou 325000, Zhejiang, Peoples R China;[3]Xi An Jiao Tong Univ, Sch Phys, MOE Key Lab Nonequilibrium Synth & Modulat Condens, Xian 710049, Peoples R China;[4]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[5]Ningbo Univ, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China

年份：2023

卷号：9

期号：5

外文期刊名：ADVANCED ELECTRONIC MATERIALS

收录：;EI(收录号：20230913658015);WOS:【SCI-EXPANDED(收录号:WOS:000942506600001)】；

基金：B.P. and Q.Z. contributed equally to this work. This work was supported by the National Natural Science Foundation of China (11974366 and 12074341), Startup Fund of Wenzhou Institute, University of Chinese Academy of Sciences (No. WIUCASQD2021014), the Fundamental Research Funds for the Central Universities, the Scientific Research and Developed Funds of Ningbo University (No. ZX2022000015), the Shanghai Supercomputer Center of China, and the National Supercomputer Center in Guangzhou.

语种：英文

外文关键词：piezoresistive effects; room-temperature ferromagnetism; two-dimensional beta-CuI crystals

摘要：2D materials are promising nanomaterials for future applications due to their predominant quantum effects and unique properties in optics, electrics, magnetics, and mechanics. However, explorations in unique properties and potential applications of novel 2D materials have been hampered by synthesis and their stability under ambient conditions. Recently, in the graphene, 2D beta-CuI is observed experimentally under ambient conditions. Here, it is shown that this 2D beta-CuI@graphene possesses unexpected piezoresistive effect and room-temperature ferromagnetism. Moreover, this 2D beta-CuI crystal is likely to be stable in a wide range of temperature, that is, below 900 K. Theoretical studies reveal that the unexpected piezoresistive effect is mainly attributable to the convergence of the electrons on Cu and I atoms to the Fermi level with increasing strain. There is a magnetic moment that is & AP;0.97 mu(B) on the edge of beta-CuI nanocrystal created by an iodine vacancy, which is considered the origin of such strong room-temperature ferromagnetism. Clearly, the 2D beta-CuI@graphene provides a promising nanomaterial in the nano-sensors with low power consumption pressure and magnetic nano-devices with a size down to atomic scale. The discovery in the present work will evoke various new 2D nanomaterials with novel properties in nanotechnology, biotechnology, sensor materials, and technologies.