Fig. 3

A Temperature profiles of Ti₃C₂T_x nanosheets and Cu₂O/Ti₃C₂T_x nanosheets under NIR laser irradiation (808 nm, 0.54 W cm⁻²). B Thermal responses of Ti₃C₂T_x nanosheets, Cu₂O/Ti₃C₂T_x nanosheets, and IR780 iodide dye (0.1 mM) dispersed in PBS solution under NIR laser irradiation for five consecutive switch on–off cycles. C UV–Vis absorption spectra of the corresponding solutions before and after five consecutive “on” and “off” cycles of NIR laser irradiation. Concentrations of Ti₃C₂T_x nanosheets and Cu₂O/Ti₃C₂T_x nanosheets in B and C were both fixed at 50 μg mL⁻¹ (in terms of Ti₃C₂T_x). Inset to C shows the photographs of corresponding solutions