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(a) Illustration of preparation of gold embedded silica nanostructure by using the combination of seed-growth method and reduction of chloroauric acid by ascorbic acid and polyvinylpyrrolidone. (b) Optical images, (c) UV-Vis spectra, and (d) Transmittance electronic microscopy (TEM) images of SiO2-based nanostructures (50 µg/mL): (i) SiO2 metal nanoparticles (NPs); (ii) SiO2 nanostructure (SiO2@Au) seed and (iii) SiO2@Au nanostructure.
