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. 2018 Sep 6;9:3618. doi: 10.1038/s41467-018-06124-1

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© The Author(s) 2018

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. 1 — Crystal structure and printing process of 2D GaPO₄ nanosheets. Ball and stick representation of the synthesised GaPO₄ crystal: a top view and b side view showing an out-of-plane structure exhibiting unit cell parameter c = 11.05 Å. c Schematic illustration of the van der Waals 2D printing technique of Ga₂O₃ nanosheet from liquid metal gallium. d Schematic setup for the chemical vapour phase reaction system used for synthesising GaPO₄ nanosheets