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Nanomaterials 2019, 9(4), 566; https://doi.org/10.3390/nano9040566

Direct Observation of Raman Spectra in Black Phosphorus under Uniaxial Strain Conditions

Department of Materials Design and Innovation, University of Buffalo, Buffalo, NY 14260, USA
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Received: 22 February 2019 / Revised: 12 March 2019 / Accepted: 25 March 2019 / Published: 8 April 2019
(This article belongs to the Special Issue Preparation and Properties of 2D Materials)
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Abstract

In this paper, we systematically studied the Raman vibration of black phosphorus (BP) transferred onto a germanium (Ge)-coated polydimethylsiloxane (PDMS) substrate, which generates a much higher contrast in BP. This engineered flexible substrate allowed us to directly observe a much thinner BP layer on the flexible substrate at the desired location. Therefore, it enabled us to perform Raman spectroscopy immediately after exfoliation. The Raman spectra obtained from several BP layers with different thicknesses revealed that the clear peak shifting rates for the Ag1, B2g, and Ag2 modes were 0.15, 0.11, and 0.11 cm−1/nm, respectively. Using this value to identify a 2–3-layered BP, a study on the strain–Raman spectrum relationship was conducted, with a maximum uniaxial strain of 0.89%. The peak shifting of Ag1, B2g, and Ag2 caused by this uniaxial strain were measured to be 0.86, 0.63, and 0.21 cm−1/Δε, respectively. View Full-Text
Keywords: black phosphorus; uniaxial strain; flexible substrate black phosphorus; uniaxial strain; flexible substrate
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Liang, S.; Hasan, M.N.; Seo, J.-H. Direct Observation of Raman Spectra in Black Phosphorus under Uniaxial Strain Conditions. Nanomaterials 2019, 9, 566.

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