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. 2018 Mar 27;16:30. doi: 10.1186/s12951-018-0350-5

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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 — TEM images for nanoparticles: a OA-Fe₃O₄ NPs, b Fe₃O₄@nSiO₂ NPs, c Fe₃O₄@nSiO₂@mSiO₂ NPs, d Fe₃O₄@SiO₂@PAA-cRGD NPs. The scale bars are 50 nm