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. 2019 Jul 10;17:83. doi: 10.1186/s12951-019-0513-z

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© The Author(s) 2019

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 — a Drug release curves of DOX from DOX/PEG-BPEI-rGO with or without NIR irradiation. b The zeta potential of GO, BPEI-GO and PEG-BPEI-rGO. c Fluorescence spectra of DOX after adsorption on PEG-BPEI-rGO in water and ethanol