Fig. 3
Photothermal effect of NAV. A Photothermal curves of PBS, AuNPs@Van, NiO NPs and NAV (NPs concentration: 125 μg/mL, 808 nm laser, 1.8 W/cm2, 10 min). B Photothermal curves of NAV (125 μg/mL) irradiated at different power laser densities (1.30, 1.55 and 1.80 W/cm2) for 10 min. C Photothermal curves of different concentrations of NAV (0, 7.80, 15.6, 31.3, 62.5, 125 and 250 μg/mL) at 1.8 W/cm2 for 10 min. D Heating and cooling profiles of NAV for 5 on/off cycles. E The heating/cooling curve of NAV under NIR laser irradiation. F The relationship between cooling time and −ln(θ) obtained from the results in E. G Infrared thermal imaging of NAV at different concentrations and different irradiation time intervals corresponding to C. H Photothermal images of NAV (125 μg/mL) within 5 min with and without magnetic enrichment