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. 2016 Oct 24;6:35505. doi: 10.1038/srep35505

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

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SEM images of (a) the surface of the pristine wood, (b) the surface of the ZNA-treated wood with low-magnification, (c) the surface of the ZNA-treated wood with high-magnification, the inset image is the cross section of ZNAs, (d) TEM images of ZNAs peeled off from the wood surface. The inset images were the corresponding HRTEM image (top right corner) and SAED pattern (right bottom).