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. 2021 Mar 23;13(6):981. doi: 10.3390/polym13060981

Figure 4.

Figure 4

PTT characteristics of BDT-IID Pdots. PTT heating curves of the BDT-IID Pdots (a) with different concentrations upon 200 mW/cm2 laser exposure at 660 nm and (b) with different laser power densities at 100 μg/mL. (c) Photothermal effect of the BDT-IID Pdots dispersions under laser irradiation at 660 nm (200 mW/cm2). Irradiation terminated after 600 s. (d) Time constant for heat transfer was determined to be τs = 145 s by applying the linear time data from the cooling period (after 600 s) versus negative natural logarithm of driving force temperature, obtained from the cooling stage of (c); (e) thermal variations of the Pdots under laser exposure at 200 mW/cm2 for seven light on/off cycles (10 min of irradiation for each cycle). (f) Change in absorbance intensity of BDT-IID Pdots and ICG after repeated laser irradiation (n = 7). The figure inserts show the changes of BDT-IID Pdots and ICG after repeated laser irradiation (n = 7). (Reprinted Permission American Chemical Society 2018) [49].