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. 2018 Apr 18;9:1543. doi: 10.1038/s41467-018-04020-2

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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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Fig. 1 — Photostability test and characterizations. a Schematic illustration of synthesis procedure for SiO₂-Au GSH clusters-BPEI composites (SAB) and photostability testing of as-prepared SAB; transmission electron microscopy (TEM) images of SAB b before and c after visible light irradiation (λ > 420 nm) for 10 h and SiO₂-Au GSH clusters-pH (SAP) e before and f after visible light irradiation for 10 h; the corresponding models of d SAB and g SAP after visible light irradiation for 10 h; high-resolution X-ray photoelectron spectroscopy (XPS) spectra of h S 2p and i Au 4f for SAB before/after visible light irradiation; j UV-vis diffuse reflectance spectrum (DRS) spectrum of SAP after 10 h visible light irradiation. Insets in b and e are the corresponding models of SAB and SAP before visible light irradiation. The histograms in c and f correspond to the particle size distributions of Au GSH clusters in the SAB and SAP after visible light irradiation for 10 h, respectively. The yellow spheres in d represent Au GSH clusters and the purple spheres in g represent Au nanoparticles. Scale bar, 5 nm