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Cytotoxicity and PA stability of GNSs with silica shells at the optimized thickness (i.e., 25 nm). (a) Cell viability with different concentrations of silica-coated GNSs. (b) Comparison of UV–vis–NIR spectra of bare GNSs and silica-coated GNSs (25 nm coating) before (solid lines) and after (dotted lines) 60-second laser irradiation. (c) TEM images of bare GNSs and silica-coated GNSs before and after laser irradiation.
