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. 2021 Jul 29;9:728066. doi: 10.3389/fchem.2021.728066

FIGURE 1.

FIGURE 1

Schematic of NIR photothermal therapy. The photothermal materials were administrated and enter the tumor cells, then excited by NIR light and transform the light energy into heat to ablate tumor cells. The lights in NIR-I and NIR-II regions have different penetration depths through tissues, and NIR-II excitation is superior to its counterpart and promised better prospect for the treatment of deep tumors.