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. 2021 Jun 7;12:3387. doi: 10.1038/s41467-021-23699-4

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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 Low magnification secondary electron image (above) and the corresponding backscattered electron image (below) of the 7% Au–Cu/PTFE, showing the dispersed Au nanoparticles (bright spots). b Secondary electron image and the corresponding EDX elemental mapping of Au and Cu for the 7% Au–Cu/PTFE. c High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) image of one 7% Au–Cu/PTFE nanofiber. d High-magnification bright-field STEM image and the corresponding elemental mapping of Au and Cu from a section of one 7% Au–Cu/PTFE nanofiber. e, f High-resolution XPS spectra of Cu 2p (e) and Au 4f (f) for 7% Au–Cu/PTFE.