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(a) Synthesis of DOX-loaded, FA-targeted NaYF4:Yb/TmeTiO2 nanocomposites for NIR-triggered PDT and chemotherapy in resistant breast cancer, (b–d) TEM and HRTEM images of NaYF4:Yb/TmeTiO2 nanocomposites. Reprinted with permission from reference [147]. Copyright 2015 Elsevier.
