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(a) Etching, (b) optical images, (c) TEM images, and (d) UV-Vis spectra of SiO2@Au nanostructures (50 µg/mL): (i) SiO2@Au without hydrofluoric acid (HF) treatment and (ii) SiO2@Au treated with HF. (e) Red-shifting of UV-Vis spectra, (f) centrifugation speed, and (g) centrifugation (2,4,6,8 in x-axis) and redispersion (3,5,7 in x-axis) of SiO2@Au synthesized at 150 M Au3+ with and without HF treatment.
