Fig. 1. (a) Schematic illustration of intranuclear radiosensitization. (b) Scanning electron microscopy (SEM) image of rattle-structured upconversion core/mesoporous silica nanotheranostics (RUMSNs). (c) Scanning transmission electron microscopy (STEM) image and the corresponding element mappings of the RUMSNs: (c1) Si; (c2) O; (c3) Y; (c4) F; (c5) Yb; (c6) Gd.
