文献类型：期刊文献

英文题名：High-Yield Synthesis of Sodium Chlorides of Unconventional Stoichiometries

作者：Xia, Xinming[1,2,3];Huang, Yingying[4];Peng, Bingquan[5];Wang, Tao[1,6];Yi, Ruobing[7];Zhao, Yimin[7];Jiang, Jie[1];Dai, Fangfang[5];Fan, Yan[6];Li, Pei[1];Tu, Yusong[2,3];Zhang, Lei[1,7];Fang, Haiping[4,5];Chen, Liang[1]

机构：[1]Ningbo Univ, Sch Phys Sci & Technol, Ningbo 315211, Peoples R China;[2]Yangzhou Univ, Sch Phys Sci & Technol, Yangzhou 225009, Peoples R China;[3]Yangzhou Univ, Microelect Ind Res Inst, Yangzhou 225009, Peoples R China;[4]East China Univ Sci & Technol, Sch Phys, Shanghai 200237, Peoples R China;[5]Univ Chinese Acad Sci, Wenzhou Inst, Wenzhou 325000, Zhejiang, Peoples R China;[6]Zhejiang A&F Univ, Dept Opt Engn, Hangzhou 311300, Peoples R China;[7]Xi An Jiao Tong Univ, Sch Phys, MOE Key Lab Nonequilibrium Synth & Modulat Condens, Xian 710049, Peoples R China

年份：2023

卷号：35

期号：41

外文期刊名：ADVANCED MATERIALS

收录：;EI(收录号：20233714704916);WOS:【SCI-EXPANDED(收录号:WOS:001073109700001)】；

基金：This work was supported by the National Natural Science Foundation of China (12074341, U1832150, 12004109, and 11974366), the Scientific Research and Developed Funds of Ningbo University (No. ZX2022000015), the Fundamental Research Funds for the Central Universities of East China University of Science and Technology, and the Talent Development Fund of Shanghai.

语种：英文

外文关键词：2D materials; cation-pi interactions; electric potential; high-yield synthesis; piezoelectricity

摘要：Abnormal salt crystals with unconventional stoichiometries, such as Na2Cl, Na3Cl, K2Cl, and CaCl crystals that have been explored in reduced graphene oxide membranes (rGOMs) or diamond anvil cells, hold great promise in applications due to their unique electronic, magnetic, and optical properties predicted in theory. However, the low content of these crystals, only <1% in rGOM, limits their research interest and utility in applications. Here, a high-yield synthesis of 2D abnormal crystals with unconventional stoichiometries is reported, which is achieved by applying negative potential on rGOM. A more than tenfold increase in the abnormal Na2Cl crystals is obtained using a potential of -0.6 V, resulting in an atomic content of 13.4 +/- 4.7% for Na on rGOM. Direct observations by transmission electron microscopy and piezoresponse force microscopy demonstrates a unique piezoelectric behavior arising from 2D Na2Cl crystals with square structure. The output voltage increases from 0 to approximate to 180 mV in the broad 0-150 degrees bending angle regime, which meets the voltage requirement of most nanodevices in realistic applications. Density functional theory calculations reveal that the applied negative potential of the graphene surface can strengthen the effect of the Na+-pi interaction and reduce the electrostatic repulsion between cations, making more Na2Cl crystals formed.