Fig. 2

a Normalized absorption spectra of monomer in THF. b Photothermal curves in toluene under laser (1064 nm, 0.60 W cm⁻²) irradiation (concentration: 0.1 mg mL⁻¹). c Molar extinction coefficients at 1064 nm (red) and the PCE (cyan) in toluene. d Normalized absorption spectra of NPs in aqueous solution. e Photothermal curves in water under laser (1064 nm, 1.0 W cm⁻²) irradiation (concentration: 0.1 mg mL⁻¹). f Molar extinction coefficients at 1064 nm (red) and the PCEs (cyan) in water. g Maps of electrostatic potential (ESP) surfaces for the compounds