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. 2016 Feb 12;11:85. doi: 10.1186/s11671-016-1288-x

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© Chen et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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.

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Fig. 1 — Reduction of NGO-PEG. a The average hydrodynamic diameter of NGO, NGO-PEG, and rNGO-PEG. b FT-IR spectra of NGO, NGO-PEG, and rNGO-PEG. c, d XPS spectra of NGO-PEG and rNGO-PEG. Inset: Photographs of NGO-PEG and rNGO-PEG solutions