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. 2020 May 22;11:2567. doi: 10.1038/s41467-020-16427-x

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© The Author(s) 2020

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 HAADF-STEM image of the NPs extracted from the P4 sample. b–g Characterization of a spherical particle marked in the red circle in a (section I). b–c EDXS mapping, d EDXS spectrum, e atomic resolution HAADF-STEM image, f fast Fourier transform (FFT) image, and g EELS spectrum of the particle. h–j Characterization of the particles marked in the yellow square in a (section II). h HAADF-STEM image and j EDXS mapping of the particles in the section II in a. i, High-resolution HAADF-STEM image of a round particle marked by the yellow arrow in h. k, HAADF-STEM image of the particles extracted from the P27 sample. l Atomic resolution HAADF-STEM image and m EDXS mapping of particles marked in the red circle in k (section I). n HAADF-STEM image and o. High-resolution HAADF-STEM image of a spherical particle marked in the yellow square in k (section II). p HAADF-STEM image, q atomic resolution HAADF-STEM image, and r–s EDXS mapping of hexagonal particles marked in the green circle in k (section III). t EELS mapping of particles marked in the purple square in k (section IV) showing a core-shell structure of the particles. u EELS spectrum of the core part of the particle in t. v High-resolution HAADF-STEM image, w EDXS mapping, and x Selected area electron diffraction (SAED) pattern of the particles marked in cyan ellipse in k (section V). Source data for d, g, u are provided as a Source Data file.