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. 2017 Jun 9;7:3155. doi: 10.1038/s41598-017-03357-w

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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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UV-Vis absorption spectra of the NP detachment tests. The solutions were collected at 0 h, 8 h, 24 h, 48 h, and 72 h. The absorption spectra were measured to determine the amount of NPs in solution. The inset images are of the original NP stock solutions used to make the NP-paper composites (“NP”) and the water solutions collected after the paper samples had been immersed for 0 h, 8 h, 24 h, 48 h, and 72 h. The results show that no significant NP signal can be seen in solution during this time period.