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. 2022 Jul 8;13:3976. doi: 10.1038/s41467-022-31699-1

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© The Author(s) 2022

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. 4 — a Scheme of the DMF-assisted etching procedure developed to transform the Pb₄S₃Cl₂/CsPbCl₃ heterostructures into Pb₄S₃Cl₂ NCs in the presence of surfactants (R-NH₂ = oleylamine, R-COOH = oleic acid). The cyan cubes and the orange spheres represent the CsPbCl₃ and the Pb₄S₃Cl₂ domains of the heterostructures, respectively. b TEM image of the starting heterostructures. The top inset shows an HAADF-STEM image of one heterostructure prior to the etching, while the bottom inset shows the FFT of the chalcohalide domain of the same image. c TEM image of the etched NCs. The top inset shows an HAADF-STEM image of one NC after the etching, while the bottom inset shows the FFT of the same image. The two FFTs demonstrate that the Pb₄S₃Cl₂ domains retain the same crystal structure before and after the etching procedure.