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. 2022 Jun 7;20:259. doi: 10.1186/s12951-022-01468-9

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© The Author(s) 2022

Open AccessThis 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/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Synthesis and characterization of MN-MXenes-AS. A Schematic illustration of the synthesis of an MN-MXenes-AS. B, C The TEM images of MXenes. D The AFM image of MXenes. E Photographic image of PDMS microneedle master mold. F, G Profile and isometric photographic images of an MN-MXenes-AS. H SEM images of an MN-PGA patch with different angles. I SEM images of an MN-MXenes-AS patch with different angles. J SEM images of MN after moisture absorption at different time points (75% humidity box, room temperature). K The comparison between the mechanical strength of MN-PGA and MN-MXenes-AS. L Absorption spectrum of AS, MXenes and MXenes-AS. M Percentages of the released AS from an MN-AS, MN-MXenes-AS in the presence of PBS or from AS in PBS