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. 2019 Jan 16;10:234. doi: 10.1038/s41467-018-08136-3

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© The Author(s) 2019

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 — In situ characterization of Pt NP oxidative dispersion. a–c HAADF-STEM images and size distribution histogram of 1Pt/Fe₂O₃-NP before, and d–f after in situ calcination at 800 °C under 1 bar flowing O₂ for 20 min: the yellow squares in panels a and d show the same sample area. A 50 nm scale bars in a, d and 10 nm scale bars in b, e. Yellow circles in panel b highlighted the particles missing after calcination for 20 min. g–i Sequential HAADF-STEM images from the same area showing the dissociation of small particles (labeled by purple and yellow circles) during in situ calcination: 5 nm scale bars; elapsed time (in seconds) indicated in upper right corner of each image