Figure 7.

(A) In vitro PA signals and optical absorbances of TiL₄-coordinated black phosphorus quantum dots (BPQDs) with various excitation wavelengths. (B) In vivo PA images of MCF-7 tumor xenografted Balb/c mice before and after intravenous injection of TiL₄-coordinated BPQDs. (C) Schematic diagram of ICG-rGO nanocomposite preparation. (D) In vitro and in vivo PA signals of ICG-rGO nanocomposites with an excitation wavelength of 780 nm. The in vivo images of HeLa tumor inoculated Balb/c nude mice were acquired before and after tail vein injection of rNGO-PEG/ICG. PA, photoacoustic; NGO, nano-graphene oxide; rNGO, reduced nano-graphene oxide; PEG, polyethylene glycolated; ICG, indocyanine green. The images are reproduced with permission from [103,107].