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. 2018 Mar 13;8:4393. doi: 10.1038/s41598-018-22828-2

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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(a and b) Transmission electron microscopy (TEM) images of polydopamine (PDA particles; 1a) and fluorescent polydopamine nanoparticles (FPNPs; 1b). (c) Ultraviolet-visible spectroscopy (UV-vis) absorption (black) and FPNPs (blue) in water and (d) FL emission spectra with gradually increased excitation wavelengths from 340 nm to 480 nm after dispersion of the FPNPs in water (50 μg mL⁻¹).