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. 2018 Feb 7;13:45. doi: 10.1186/s11671-018-2459-8

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© The Author(s). 2018

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. 5 — UV/Vis characterization of functionalized MNPs. UV/Vis spectra of a 5 μM FA-NHS solution and of NH₂@MNPs, and PEG,FA@MNPs colloidal dispersions. Note that the high background observed in the spectra of NH₂@MNPs and PEG,FA@MNPs is due to the scattering of the nanoparticle colloidal dispersion