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. 2017 Nov 14;8:1490. doi: 10.1038/s41467-017-01521-4

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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 — HAADF-STEM images of Pt single atoms. a Pt nanocrystals with a size of ~2 nm formed by normal photochemical reduction of H₂PtCl₆ aqueous solution. b Pt single atoms dispersed on ultrathin carbon film, with each bright dot corresponding to one individual Pt atom, with a size of ~0.1 nm. c Densely and homogeneously dispersed Pt single atoms on mesoporous carbon. d Pt₁/MWCNTs, indicating that Pt existed completely as isolated single atoms. e Pt₁/graphene, with concomitant Pt single atoms, nanoclusters and sub-nanometer clusters. f Atomically dispersed Pt on titanium oxide nanoparticles. g Pt single atoms attached on the surface of zinc oxide nanowires. h Ag and i Au single atoms prepared by a similar iced-photochemical route. (scale bar, 2 nm)