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. 2017 Jun 5;8:15714. doi: 10.1038/ncomms15714

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Copyright © 2017, The Author(s)

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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(a) Raman spectrum, (b) intensity of peak, (c) centre position of peak, (d) intensity of A_1g peak and (e) centre position of A_1g peak, (f) PL spectra from the middle of the grain A1 (red curve, taken from the area marked with white line in g and from GB1 in the middle of the flake (black curve, taken from the area marked with a black dashed line in g. (g) PL intensity image of the 680 nm peak and (h) centre position of the 680 nm peak. Intensities and peak positions are acquired by Gaussian fitting. Scale bars, 10 μm. Colour scale bars are in CCD counts (Raman and PL intensities), in cm⁻¹ (Raman peak positions) and in nm (PL peak position).

Inline graphic — (a) Raman spectrum, (b) intensity of peak, (c) centre position of peak, (d) intensity of A_1g peak and (e) centre position of A_1g peak, (f) PL spectra from the middle of the grain A1 (red curve, taken from the area marked with white line in g and from GB1 in the middle of the flake (black curve, taken from the area marked with a black dashed line in g. (g) PL intensity image of the 680 nm peak and (h) centre position of the 680 nm peak. Intensities and peak positions are acquired by Gaussian fitting. Scale bars, 10 μm. Colour scale bars are in CCD counts (Raman and PL intensities), in cm⁻¹ (Raman peak positions) and in nm (PL peak position).