Nam Gwang-Hyeon, He Qiyuan, Wang Xingzhi, Yu Yifu, Chen Junze, Zhang Kang, Yang Zhenzhong, Hu Dianyi, Lai Zhuangchai, Li Bing, Xiong Qihua, Zhang Qing, Gu Lin, Zhang Hua
Center for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
Adv Mater. 2019 May;31(21):e1807764. doi: 10.1002/adma.201807764. Epub 2019 Apr 10.
Crystal phases play a key role in determining the physicochemical properties of a material. To date, many phases of transition metal dichalcogenides have been discovered, such as octahedral (1T), distorted octahedral (1T'), and trigonal prismatic (2H) phases. Among these, the 1T' phase offers unique properties and advantages in various applications. Moreover, the 1T' phase consists of unique zigzag chains of the transition metals, giving rise to interesting in-plane anisotropic properties. Herein, the in-plane optical and electrical anisotropies of metastable 1T'-MoS layers are investigated by the angle-resolved Raman spectroscopy and electrical measurements, respectively. The deconvolution of J and J peaks in the angle-resolved Raman spectra is a key characteristic of high-quality 1T'-MoS crystal. Moreover, it is found that its electrocatalytic performance may be affected by the crystal orientation of anisotropic material due to the anisotropic charge transport.
晶体相在决定材料的物理化学性质方面起着关键作用。迄今为止，已发现许多过渡金属二硫属化物相，如八面体（1T）、扭曲八面体（1T'）和三角棱柱体（2H）相。其中，1T'相在各种应用中具有独特的性质和优势。此外，1T'相由过渡金属独特的锯齿链组成，产生了有趣的面内各向异性性质。在此，分别通过角分辨拉曼光谱和电学测量研究了亚稳1T'-MoS层的面内光学和电学各向异性。角分辨拉曼光谱中J和J峰的去卷积是高质量1T'-MoS晶体的一个关键特征。此外，发现由于各向异性电荷传输，其电催化性能可能受各向异性材料晶体取向的影响。
