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. 2020 Apr 24;12:100. doi: 10.1007/s40820-020-00431-3

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Schematic illustration and characterization of Ag₂S@BSA-SNO nanoparticles. a A schematics illustration showing Ag₂S growth in BSA nanocage and NO donor function group formation. b, c TEM images of Ag₂S@BSA and Ag₂S@BSA-SNO. Inset: picture of Ag₂S@BSA and Ag₂S@BSA-SNO solution (20 mg mL⁻¹). d Dynamic light scattering (DLS) analysis of Ag₂S@BSA, Ag₂S@BSA-SH and Ag₂S@BSA-SNO. e UV–Vis–NIR spectra of Ag₂S@BSA, Ag₂S@BSA-SH and Ag₂S@BSA-SNO solution. f STEM image of Ag₂S@BSA-SNO nanoparticles to show elements’ locations