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. 2021 Jun 10;8(16):2101295. doi: 10.1002/advs.202101295

Figure 3.

Figure 3

NIR‐ and humidity‐actuating performance of the material. a) Schematic illustration of a bilayer smart gripper bending on exposure to NIR/humidity. b) Optical images of PU/CNC bilayer film and PU/CNC@glucose bilayer film before and after bending for 5000 times. c) UV‐visible spectrum and d) Laser confocal Raman microspectroscopy of the material. Photographs of an actuator reversibly bending when e) humidity and g) NIR light is alternately switched on and off. Bending angle and actuation force of the film with f) humidity and h) NIR light alternately turned on and off.