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. 2016 Feb 12;11:85. doi: 10.1186/s11671-016-1288-x

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© Chen et al. 2016

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.

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Fig. 2 — Synthesis and characterization of rNGO-PEG/ICG. a, b AFM images of rNGO-PEG and rNGO-PEG/ICG. c UV–vis absorption spectra of free ICG, rNGO-PEG, and rNGO-PEG/ICG solutions. d Fluorescence spectra of ICG and rNGO-PEG/ICG solutions with the same concentration of ICG