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. 2021 Jun 3;12:3303. doi: 10.1038/s41467-021-23069-0

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© The Author(s) 2021

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 — a FTIR spectra of Ti-PAA, Ti-PAA-NH and Ti-PAA-NCl. b SEM images showing the surface morphology of Ti, Ti-OH and Ti-PAA-NCl (upper scale bars = 400 nm, lower scale bars = 200 nm). c CSLM images of the surface roughness of Ti, Ti-OH and Ti-PAA-NCl. d Elemental mapping of Ti-PAA-NCl showing the homogeneous distribution of Cl in the pore wall of N-halamine polymeric coating (scale bar = 5 μm). e Water contact angle of Ti-PAA-NCl. f Young’s modulus mapping via AFM for the N-halamine polymeric coating of Ti-PAA-NCl (scale bar = 200 nm). g TG curve of Ti-PAA-NCl showing good thermal stability. h Storage stability and regeneration of oxidative Cl⁺ for Ti-PAA-NCl (n = 3). The pink part gives the Cl⁺ contents of the dechlorinated and rechlorinated products of Ti-PAA-NCl with 8 weeks of storage. Error bars = s.d.