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TEM images of (a) SiO2, (b) SiO2/Au, and (c) SiO2@Au/QD. HTEM images of (d) SiO2@Au/QD and (e) Au lattice. Elemental mapping images (f and g) of the shell of SiO2@Au/QD NP. (j) ζ-potential of the products at each stage. (k) Plasmon resonance spectra of SiO2, SiO2@PEI, SiO2/Au, and SiO2@Au/QD. (l) Fluorescence spectra of SiO2, SiO2@PEI, SiO2/Au and SiO2@Au/QD under UV light. (m) Photographs of sample plots of each phase product under (i) natural light and (ii) UV light.
