Molecular Diffusion–Driven Motion in 2D Graphene Film

Here, a new mode for driving the motion of graphene films on water by organic molecular diffusion is reported. Because of ultralight weight, micro/nanochannels constructed by interlayered sheets, the hydrophobic nature of graphene, and the one‐way 2D diffusion of organic molecules into water induce force/torque for driving the movement of the film. It is worth mentioning that the rectangular film filled with ethanol (1 cm × 2 cm) shows a high rotational speed of 300 rpm on the water. Importantly, the continuous rotation of the graphene film can be realized by continuously adding the collected ethanol from the ethanol–water mixture under visible light irradiation. Moreover, the folded graphene film filled with ethanol can push a porcelain boat (12 g) on water with a velocity of 50 mm s−1. Thus, it is believed that this new driving mode can be applied in the fields of microflow reactors, electric generating device, minisensors, and actuators.