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. 2018 Nov 15;20(11):305. doi: 10.1007/s11051-018-4406-0

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© The Author(s) 2018

Open Access This 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.

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Fig. 6 — PL emission spectra for Au NP solutions excited at 317 nm (a). PL emission spectra for Au-CYS NP colloidal solutions at different pH values (b)