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. 2020 Nov 16;10:19877. doi: 10.1038/s41598-020-76716-9

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Single PL spectra of SWCNTs collected at 575 nm excitation as a function of employed BPO concentration, (b) calculated ratios of E₁₁^*/E₁₁ intensities as a function of employed BPO concentration, (c) the intensity of E₁₁ and E₁₁^* + E₁₁^*− peaks as a function of employed BPO concentration, and (d) position of maxima of E₁₁ and E₁₁ peaks as a function of employed BPO concentration.