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. 2019 Apr 8;9:5796. doi: 10.1038/s41598-019-42047-7

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© The Author(s) 2019

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 GNR of different particle sizes and surface functionalities. (A) Optical absorption spectra and suspension photos of CTAB-GNR, m-PEG-GNR, NH₂-PEG-GNR and COOH-PEG-GNR (AR ~ 4). (B) Optical absorption spectra and suspension photos of CTAB-GNR and PEG-GNR (AR ~ 2). (C) Optical absorption spectra and suspension photos of CTAB-GNR, DSPE-PEG-GNR/water, DSPE-PEG-GNR/toluene and DSPE-PEG-SH/water. (D) Optical absorption spectra and suspension photos of CTAB-GNR, Chol-PEG-GNR and Chol-PEG-SH/water. (E) Zeta potentials of GNR of different particle sizes and surface functionalities (F) Hydrodynamic diameter of GNR of different particle sizes and surface functionalities measured by DLS (nm). Data in E and F are presented as mean ± SD (n = 3). AR: aspect ratio.