Figure 2.

NIR-II photothermal and photoacoustic properties of rGO-AuNP nanocomposite. (A) Temperature variations of PBS, rGO, the mixture of rGO and AuNP and rGO-AuNP irradiated with a 1,061 nm laser at a power density of 0.5 W/cm² as a function of PEG irradiated with a 1,061 nm laser at a power density of 0.5 W/cm² as a function of time. (B) Temperature increase curves of the rGO-AuNP at different concentrations irradiated with laser. (C) Photoacoustic images of rGO, AuNPs, and rGO-AuNP aqueous solutions at different concentrations. (D) PA intensities of rGO, AuNPs, and rGO-AuNP aqueous solutions illuminated with 1,250 nm laser as a function of OD₁₂₅₀ values.