Illustration of the redox-responsive IR820-SS-CPT NPs for chemo-photothermal therapy. A Schematic diagram of self-assembly of the IR820-SS-CPT NPs via hydrophobic and π–π stacking interactions. B The speculated mechanisms of CPT release from the IR820-SS-CPT NPs by treatment of GSH. C Advantages of the proposed IR820-SS-CPT NPs