各向异性
拉曼光谱
二硫化钼
单层
材料科学
极化(电化学)
各向同性
凝聚态物理
声子
分子物理学
光电子学
纳米技术
光学
化学
物理
物理化学
冶金
作者
Jiangbin Wu,Huan Zhao,Yuanrui Li,Douglas A. A. Ohlberg,Wei Shi,Wei Wu,Han Wang,Ping‐Heng Tan
标识
DOI:10.1002/adom.201500707
摘要
Two-dimensional Molybdenum Disulfide (MoS2) has shown promising prospects for the next generation electronics and optoelectronics devices. The monolayer MoS2 can be patterned into quasi-one-dimensional anisotropic MoS2 nanoribbons (MNRs), in which theoretical calculations have predicted novel properties. However, little work has been carried out in the experimental exploration of MNRs with a width of less than 20 nm where the geometrical confinement can lead to interesting phenomenon. Here, we prepared MNRs with width between 5 nm to 15 nm by direct helium ion beam milling. High optical anisotropy of these MNRs is revealed by the systematic study of optical contrast and Raman spectroscopy. The Raman modes in MNRs show strong polarization dependence. Besides that the E' and A'1 peaks are broadened by the phonon-confinement effect, the modes corresponding to singularities of vibrational density of states are activated by edges. The peculiar polarization behavior of Raman modes can be explained by the anisotropy of light absorption in MNRs, which is evidenced by the polarized optical contrast. The study opens the possibility to explore quasione-dimensional materials with high optical anisotropy from isotropic 2D family of transition metal dichalcogenides.
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