Fig. 1: Preparation process and fundamental physical properties of TPU/CPA/DJ sensors.

a Schematic of the multilayer-assembled TPU/CPA/DJ flexible pressure sensor fabrication process. b Optical image demonstrating ultra-lightweight properties (density: 0.12 g/cm³), where the sensor adheres to a leaf surface without slippage or deformation. c Brightness change of LEDs during finger pressure loading and unloading. d Optical image of a sample stretched longitudinally with a 200 g hydrothermal reactor cap. e Optical picture of the sample when folded in half.