Fig. 4
From: Near-infrared photoresponsive drug delivery nanosystems for cancer photo-chemotherapy
(Reproduced from Ref. [71] with permission from Elsevier, copyright 2020)
a Schematic illustration of thermosensitive urchin-like Bi2S3 hollow nanoparticles as photothermal responsive DDSs for photothermal-chemotherapy. b Cumulative release of DOX from PD@BS induced by cyclic “turn-on” and “turn-off” of NIR light at different times. c The growth curves of MDA-MB-231 tumors in different groups during a period of 12 days