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. 2021 Nov 17;198:113810. doi: 10.1016/j.bios.2021.113810

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Fig. 2 — (a–d) TEM images of dSiO₂ template (a), dSiO₂/QD assembly (b), dSiO₂/QD/OS composite (c), and SQS nanosphere (d). (e–h) SEM images of dSiO₂ templates (e), dSiO₂/QD assemblies (f), dSiO₂/QD/OS composites (g), and SQS nanospheres (h).