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. 2018 Jan 29;16:6. doi: 10.1186/s12951-017-0332-z

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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 — a UV–visible spectrum of the DMAP-PTA-AuNPs at different time intervals showing surface plasmon resonance band at 520 nm. DMAP-PTA-AuNPs tend to aggregate after 48 h as can be observed by surface plasmon resonance band’s broadening. b TEM image of the DMAP-PTA-AuNPs showing polydispersed particles in the range of 5–20 nm