Fig. 5
From: Bioinspired and bristled microparticles for ultrasensitive pressure and strain sensors
Wearable demonstration and device integration. a Sensing signals from a prototype device interfaced with the wrist (inset) for tracking the bending movement. b Signals from the device interfaced with the neck (inset) for tracking the swallowing motion. The increased baseline current in a, b compared to that in a free device (Supplementary Figure 2c) resulted from a static/baseline pressure exerted on the device for maintaining a close interface. c Registered pulse signals from the wrist, with the black curve indicating a normal heart rate (~66 beats per minute) and red curve the rate (~96 beats per minute) after exercise. d Respiratory signals (bottom panel) registered by a device placed in a mask (top panel), with the black curve indicating a normal rate (~21 breaths per minute) and red curve the rate (~52 breaths per minute) after exercise. e Simulated conductance distribution (bottom panel) in a continuous SUSM thin film sandwiched between two crossed top and bottom electrodes (top panel). G0 denotes the conductance contributed from the squared region (dashed lines) centered at the cross-point. Gsurr denotes the conductance contributed from the rest area that has a distance d away from the edge of electrode. The widths of both electrodes are 100 µm. The purple, blue, red, and blue curves correspond to SUSM film thicknesses of 30, 50, 70, and 90 µm, respectively. f (Top left) Schematic of a tactile sensor array made from a continuous SUSM film (70 µm thick), featuring individually addressable 4 × 4 top (Ag) electrodes and a common bottom (ITO) electrode. (Top right) Actual photo of fabricated 4 × 4 device array; each device size is 0.5 × 0.5 cm2 and the pitch size is 0.9 cm. (Bottom) Current responses from all the devices corresponding to local pressure exerted by three grains of rice
