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(A) TEM images and (B) UV-Vis absorption spectra of (i) SiO2 NPs, (ii) SiO2@Ag NPs, and (iii) SiO2@Ag NPs treated with a 10 µM AOH solution. Black, blue, and red lines in the absorption spectra correspond to (i), (ii), and (iii), respectively. The scale bars in (i–iii) are 200 nm.
