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. 2019 May 20;5:21. doi: 10.1038/s41378-019-0060-7

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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. 2 — a SEM image and b, c TEM images of pure SnO₂ nanosheets; d SEM image, e TEM image and f HRTEM image of SnO₂-3Ni nanosheets; g XPS survey spectra of the pure SnO₂ and SnO₂-3Ni samples; h high-resolution core level Sn 3d spectra of pure SnO₂ nanosheets and SnO₂-3Ni; i high-resolution core level Ni 2p spectra of SnO₂-3Ni