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. 2017 Oct 13;8:930. doi: 10.1038/s41467-017-01083-5

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© The Author(s) 2017

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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Fig. 2 — ATR-FTIR spectra of the samples before and after plasma reaction. Spectra a, c are taken from pure NaN₃ without carbon nanotube support before and after plasma reaction, respectively; and spectra b, d are from plasma-reacted NaN₃ deposited on short MWNTs before and after plasma reaction, respectively. The IR-active modes for NaN₃ are the bending ν₂ mode of the azide ion at 638 cm⁻¹ (not shown here) and the anti-symmetric stretching ν₃ mode of the azide ion at 2100 cm⁻¹