Fig. 2.

Photothermal performance and conversion efficiency of CAZ NPs. (a) UV–vis–NIR absorption spectra of CAZ NPs dispersions with different concentrations. (b) Temperature curves of 200 ​μL CAZ NPs dispersions with different concentrations after 10 ​min of irradiation (808 ​nm, 2.0 ​W ​cm⁻²). (c) Temperature variation curves of CAZ NPs dispersion (200 ​μg ​mL⁻¹, 200 ​μL) under different powers densities of 808 ​nm NIR. (d) The heating and cooling curves of CAZ NPs under five on/off NIR laser cycles (200 ​μg ​mL⁻¹, 2.0 ​W ​cm⁻²). (e) The rise and cooling down of the temperature level of CAZ NPs. (f) Linear fitting plots of time versus −ln ​θ during the cooling period.