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. 2017 Aug 7;8:204. doi: 10.1038/s41467-017-00161-y

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© The Author(s) 2017

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 — In situ results from a Pt₃Co NP after oxygen annealing at 720 °C. a HAADF-STEM image taken inside the gas cell showing the Pt₃Co NP after a 30-min annealing in oxygen atmosphere. Scale bar, 2 nm. b FFT pattern of the NP in a. c Unit cell of the L1₂ phase illustrating the ordered intermetallic Pt₃Co structure. Yellow and blue spheres represent Pt and Co atoms, respectively. d A false-colour cropped image of the ordered intermetallic feature taken from the blue box in a and the intensity profiles taken along the lines indicated by the blue and black arrows, respectively. e Enlarged false colour image of the (100) surface taken from the red box in a, and the intensity profiles taken along the atomic layers marked by green and blue rectangles showing the segregated Pt-rich surface. Scale bar, 2 Å. f Simulated HAADF-STEM image of a L1₂ intermetallic Pt₃Co model with Pt-segregated surfaces, and the intensity profiles from the two atomic layers marked by green and blue rectangles