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. 2015 Oct 29;13:76. doi: 10.1186/s12951-015-0138-9

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© Chen et al. 2015

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. 3 — Physical stability of Bi₂S₃-QD@DSPE during storage at 4, 25, and 37 °C. Changes in mean particle size (a), polydispersity index (b) and zeta potential (c) of Bi₂S₃-QD@DSPE were examined