Figure 3
From: Flower-like PEGylated MoS2 nanoflakes for near-infrared photothermal cancer therapy
(A) Temperature profiles of pure water and MoS2-PEG nanoflakes dispersions with different concentrations (5, 20, 40, 60 and 80 μg/mL) as a function of 808-nm laser irradiation time for 5 min at a power density of 2 W/cm2. (B) Photothermal heating curves of MoS2-PEG nanoflakes solution at the concentration of 80 μg/mL under 808-nm laser irradiation at various power densities (0.25, 0.5, 1.0 and 2.0 W/cm2) for 5 min. (C) Photothermal effect of an aqueous dispersion of MoS2-PEG nanoflakes solution irradiated by using an 808-nm laser at a power density of 2 W/cm2. The laser was turned off after irradiation for 300 s. (D) Plot of cooling time (after 300 s) versus negative natural logarithm of the driving force temperature obtained from cooling stage as shown in (C). The time constant (τs) for heat transfer of the system is determined to be 157 s. (E) Temperature monitoring of a MoS2-PEG nanoflakes solution at the concentration of 60 μg/mL during for successive six cycles of an on-and-off laser. (F) UV-vis absorption spectra of the MoS2-PEG nanoflakes solution before and (right) after NIR 808-nm irradiation at the power of 2 W/cm2 for successive six cycles of an on-and-off laser irradiation. The insets show that digital photographs of the MoS2-PEG nanoflakes solution (left) before and (right) after irradiation.
