Fig. 2

a Temperature curves against time of Control (PBS) and MoSe₂ NUs with diverse concentrations (20–100 μg mL⁻¹) under 808 nm laser. b IR thermal images of MoSe₂ NUs with different laser power and irradiation time. c Five irradiation/cooling cycles of MoSe₂ NUs (100 μg mL⁻¹). d The photothermal profile of MoSe₂ NUs in PBS under NIR irradiation for 600 s and then NIR laser was switched off. e Linear time data versus −ln(θ) acquired from the cooling period of (d)