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. 2018 Feb 27;16:19. doi: 10.1186/s12951-018-0344-3

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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. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Morphological characterization YPMS nanoparticles. a Transmission electron microscopy images of a bare YP and YP nanoparticles covered with mesoporous silica (YPMS). b X-ray diffraction pattern of YP bare or covered with mesoporous silica, YPMS. Values correspond to hkl coordinate of the YAG cubic crystal. c Hydrodynamic diameters of YPMS and YPMS@PpIX@FA in water using dynamic light scattering. d Nitrogen adsorption–desorption isotherms of YPMS nanoparticles. Filled square adsorption, empty square desorption. e Pore size distribution of the mesoporous layer of YPMS nanoparticles