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. 2018 Mar 12;8:4349. doi: 10.1038/s41598-018-22467-7

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© The Author(s) 2018

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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Growth properties of CNT carpets on pristine and ion beam-damaged SS. Plots of CNT carpet height as a function of growth time for Pristine-20 and Damaged-20 (a). SEM image of densified CNT carpets grown for 120 min from Fe catalyst supported on Pristine-20 (b) and its corresponding false-color image showing the densified region (c). SEM image of densified CNT carpets grown for 120 min from Fe catalyst supported on Damaged-20 (d) and its corresponding false-color image showing the densified region (e).