Fig. 1: Overview of the iontronic pressure sensor.

Schematic showing the a design, b performance, and application of the flexible iontronic pressure sensor in c health monitoring, d interactive robotic hand, and e smart weight scale. Note: the dielectric layer (pink) based on the iontronic liquid (IL) is sandwiched between the bottom gradient microstructured pyramidal electrode (yellow) and the top polyethylene terephthalate (PET)/indium tin oxide (ITO) electrode (gray). Linear sensing factor is defined as the product of the sensitivity and the corresponding linear sensing range.