3.6. Wearability
The performance of the photothermal membranes is evaluated on human skin as shown in Fig. 7a, b, and Supplementary Video 2. The top is the initial CS/MWCNTs concentration, the bottom left is 1/2 of the initial concentration, the bottom right is 1/4 of the initial concentration, and in the middle of the three is PLLA (which is difficult to distinguish from the figure due to its very poor photothermal performance). It can be seen that the high concentration of CS/MWCNTs/APLLA always maintains the highest temperature, which slowly increases with time up to 46 ˚C without discomfort to human skin. The photothermal membrane was pasted on clothes and evaluated for its photothermal performance (Fig, 7c and d). It can rise 7.6 ˚C in two minutes outdoors (865 Wm-2), which is significantly better than PLLA, demonstrating its applicability to wearable photothermal devices. By co-culturing with HSF for 12 and 24 hours, the photothermal membrane also demonstrated excellent biocompatibility (Fig. 7e and f).