Fig. 3. (A) Photothermal effect of SN38&ICG/Gd&Yb-LDH upon 808 nm irradiation at different power densities (0.5, 1.0, and 1.5 W cm^–2), with ICG and PBS as control samples. (B) Photothermal photographs of PBS, ICG and SN38&ICG/Gd&Yb-LDH upon 808 nm irradiation at 1.0 W cm^–2. (C) Photostability tests of SN38&ICG/Gd&Yb-LDH and ICG for four cycles. (D) Release curves of SN38 from SN38&ICG/Gd&Yb-LDH in PBS with 808 nm irradiation at pH 5.5, 6.5 and 7.4 (1.0 W cm^–2), respectively. (E) Photographs of the SN38&ICG/Gd&Yb-LDH suspension before and after NIR laser irradiation. (F) Normalized absorbance of DPBF in the presence of ICG, SN38&ICG/Gd&Yb-LDH and blank samples with 808 nm irradiation (1.0 W cm^–2).