Fig. 4From: IGF1 receptor-targeted black TiO2 nanoprobes for MRI-guided synergetic photothermal-chemotherapy in drug resistant pancreatic tumorPhotothermal properties of bTiO2-Gd-COOH. a, c I, bTiO2-Gd-COOH irradiated by 808 nm laser with power density of 0.4–2.0 W cm−2 for 10 min. b, c II, the nanoprobes at various concentrations irradiated with 1.2 W cm−2 808 nm laser for 10 min. d Photothermal stability of bTiO2-Gd-COOHBack to article page