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. 2020 Jul 21;10:12096. doi: 10.1038/s41598-020-68994-0

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© The Author(s) 2020

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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Characterization of gold nanoparticles (A) Schematic diagram of the GNP and all the ligands used to form the ${GNP}_{PEG - RGD}$ complex. (B) Secondary electron TEM images of ${GNP}_{PEG - RGD}$ complex. (C) Darkfield image of GNPs overlayed with spectrum measured using hyper spectral imaging. The GNPs have a clear spectrum relative to background. (D) Hydrodynamic diameter from DLS and (E) ζ-potential of the GNPs before and after conjugation with PEG and RGD.