. 2017 Apr 27;12:312. doi: 10.1186/s11671-017-2084-y
© The Author(s). 2017
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.
Fig. 11.
Schematic illustration of the enhanced contrast mechanism of PEG-SPION