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. 2019 Jan 14;20(2):315. doi: 10.3390/ijms20020315

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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UV-Vis spectra for SiO₂@Ag NPs, SiO₂@Ag@cysteinyl-β-CD NPs, SiO₂@Ag@EDA-β-CD NPs, and SiO₂@Ag-PEG NPs. (i) SiO₂@Ag NPs, (ii) SiO₂@Ag@cysteinyl-β-CD NPs, (iii) SiO₂@Ag@EDA-β-CD NPs, and (iv) SiO₂@Ag-PEG NPs. (Inset: Photograph of synthesized NP solutions using four kinds of ligands, showing the color change).