摘要
Two-dimensional(2 D) transition metal phosphides(TMPs) are predicted with many novel properties and various applications. As a member of TMPs family, molybdenum phosphide(MoP) exhibits many exotic physicochemical properties. However, the synthesis of high-quality2 D MoP single crystals is not reported due to the lack of reliable fabrication method, which limits the exploration of 2 D MoP. Here, we report the growth of high-quality ultrathin MoP single crystals with thickness down to 10 nm on liquid metals via chemical vapor deposition(CVD). The smooth surface of liquid Ga is regarded as a suitable growth substrate for producing 2 D MoP single crystals. The Mo source diffuses toward the Ga surface due to the high surface energy to react with phosphorus source, thus to fabricate ultrathin MoP single crystals. Then, we study the second harmonic generation(SHG) of 2 D MoP for the first time due to its intrinsic noncentrosymmetric structure. Our study provides an new approach to synthesize and explore other 2 D TMPs for future applications.
二维过渡金属磷化物(TMPs)有许多新奇的性质和应用.作为二维TMPs的一员,二维MoP有许多独特的物理化学性质.然而由于缺乏制备二维MoP的方法,目前还未成功制备二维MoP,因此限制了对二维MoP众多性质的探索.本文采用化学气相沉积法在液态金属镓(Ga)上制备了厚度为10 nm的二维MoP单晶.液态Ga具有原子级平整的表面,能作为制备二维材料的合适生长基底.在生长过程中, Mo源扩散到Ga表面与磷源反应,从而在Ga表面反应得到二维MoP单晶.此外,由于二维MoP具有本征的非中心对称结构,文中首次研究了二维MoP的二次谐波信号的产生.本文为其他二维TMPs的制备和性质探索提供了新思路.
作者
Feifei Cao
Shuting Zheng
Jingjing Liang
Zhi Li
Bin Wei
Yiran Ding
Zhongchang Wang
Mengqi Zeng
Nan Xu
Lei Fu
曹菲菲;郑舒婷;梁晶晶;李志;卫斌;丁一然;王中长;曾梦琪;徐楠;付磊(Institute for Advanced Studies(IAS),Wuhan University,Wuhan 430072,China;College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,China;MIIT Key Laboratory of Advanced Display Materials and Devices,Ministry of Industry and Information Technology,Institute of Optoelectronics&Nanomaterials,Nanjing University of Science and Technology,Nanjing 210094,China;Department of Quantum and Energy Materials,International Iberian Nanotechnology Laboratory(INL),4715-330 Braga,Portugal)
基金
supported by the National Natural Science Foundation of China (21673161 and 21905210)
the Sino-German Center for Research Promotion (GZ 1400)。
