Journal Highlight: Identifying the crystalline orientation of black phosphorus using angle-resolved polarized Raman spectroscopy

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  • Published: Mar 2, 2015
  • Author: spectroscopyNOW
  • Channels: Raman
thumbnail image: Journal Highlight: Identifying the crystalline orientation of black phosphorus using angle-resolved polarized Raman spectroscopy
Angle-resolved polarized Raman spectroscopy was used to identify the crystal orientation of black phosphorus sheets, that is, the zigzag and armchair directions.

Image: courtesy Alshaer666

Identifying the crystalline orientation of black phosphorus using angle-resolved polarized Raman spectroscopy

Angewandte Chemie International Edition, 2015, 54, 2366-2369
Juanxia Wu, Nannan Mao, Liming Xie, Hua Xu and Jin Zhang

Abstract: An optical anisotropic nature of black phosphorus (BP) is revealed by angle-resolved polarized Raman spectroscopy (ARPRS), and for the first time, an all-optical method was realized to identify the crystal orientation of BP sheets, that is, the zigzag and armchair directions. We found that Raman intensities of Ag1, B2g, and Ag2 modes of BP not only depend on the polarization angle α, but also relate to the sample rotation angle θ. Furthermore, their intensities reach the local maximum or minimum values when the crystalline orientation is along with the polarization direction of scattered light (es). Combining with the angle-resolved conductance, it is confirmed that Ag2 mode intensity achieves a relative larger (or smaller) local maximum under parallel polarization configuration when armchair (or zigzag) direction is parallel to es. Therefore, ARPRS can be used as a rapid, precise, and nondestructive method to identify the crystalline orientation of BP layers.

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