Fig. 6
Recognition of different liquid molecules. a The circuit schematic illustration of a sensory system to identify different liquid molecules. b The 3D-pringting architecture of the sensory system. c A photograph of the 3D-pringting sensory system (scale bar: 2 cm). d A photograph of the 3D-pringting sensory system attached to a robotic hand (scale bar: 2 cm). e–i Different capacitive responses when different liquids, i.e., e water, f DMF, g ethanol, h acetone, i n-hexane, drip on the robotic hand covered with the sensory system
