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Title: | Giant anisotropic Raman response of encapsulated ultrathin black phosphorus by uniaxial strain | Authors: | Li, Y Hu, Z Lin, S Lai, SK Ji, W Lau, SP |
Issue Date: | 18-May-2017 | Source: | Advanced functional materials, 18 May 2017, v. 27, no. 19, 1600986 | Abstract: | 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 1 g, B 2g, and A 2 g 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 ≈−11 cm−1/% strain. In addition, the Grüneisen parameter is as high as ≈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. | Publisher: | Wiley-VCH | Journal: | Advanced functional materials | ISSN: | 1616-301X | EISSN: | 1616-3028 | DOI: | 10.1002/adfm.201600986 | Rights: | © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim This is the peer reviewed version of the following article: Li, Y., Hu, Z., Lin, S., Lai, S. K., Ji, W., & Lau, S. P. (2017). Giant anisotropic Raman response of encapsulated ultrathin black phosphorus by uniaxial strain. Advanced Functional Materials, 27(19), 1600986, which has been published in final form at https://doi.org/10.1002/adfm.201600986. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. |
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