期刊
ADVANCED FUNCTIONAL MATERIALS
卷 27, 期 19, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201600986
关键词
-
类别
资金
- PolyU grants [1-ZE14, 1-ZVGH]
- Research Grants Council (RGC) of Hong Kong [PolyU 153030/15P]
- Postdoctoral Science Foundation of China [7131701013]
- Hong Kong Scholars Program [G-YZ36]
The giant anisotropic Raman response of encapsulated ultrathin black phosphorus (BP) is reported by uniaxial strain. A modified bending technique is employed to apply precise uniaxial tensile strain along the zigzag or armchair direction of the ultrathin BP encapsulated by a layer of polymethyl methacrylate. The Raman shift rates of the A(g)(1), B-2g, and A(g)(2) modes are significantly distinct for strain applied along different directions. For the strain applied along zigzag direction, the Raman shift rate of the B-2g mode can reach a remarkable value of approximate to-11 cm(-1)/% strain. In addition, the Gruneisen parameter is as high as approximate to 2.5, which is the largest among all the reported common 2D materials. Density functional perturbation theory calculations are performed to understand the exceptional anisotropic strain response discovering that not only the bond lengths but also the bond angels are changed in the strained ultrathin BP, which lead to the giant anisotropic Raman response. Furthermore, an alternative method based entirely on the strained ultrathin BP and nonpolarized Raman spectroscopy is demonstrated to determine the crystallographic orientations of ultrathin BP. This work paves a way to study the strain-induced anisotropic electrical conductance and magnetotransport properties of BP.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据