Fig. 8: Flexible pressure sensors for detections of motion, pulse and biomechanics of skin.

a A strain sensor fixed to a data glove (higher left), relative changes in resistance versus time for data glove configurations. b Photograph of a device laminated on a wrist and a device wrapped on a cylindrical glass support (inset). c Schematic illustration to detect pulse on a human’s neck with a microhair sensor. d Schematic illustration of the working mechanism of piezoresistive CNFNs and the pressure sensor, which is bio-inspired by human’s hairy skin. e Photographs of CNFNs sensor attached onto the wrist to detect the pulse and fixed onto the human neck to identify voice. f Preparation process for CB@AP composites (top), and schematic illustration of the flexible multilayer CB@AP pressure sensor. g Array electronic skin for spatial pressure distribution. h The photograph of the sensor array, the scale bar of inset is 2 mm. i The process of pulse detection by a soft prosthetic hand integrated with the tactile sensor and the detected pulse signal. j The pressure distribution at different moment when two soft hands rolled a ping pong ball. a Reproduced with permission¹⁵⁷ (Copyright 2011, Nature Publish Group). b Reproduced with permission¹⁵⁸ (Copyright 2014, Nature Publish Group). c Reproduced with permission⁷² (Copyright 2015, Wiley-VCH). d, e Reproduced with permission²⁷ (Copyright 2019, the Royal Society of Chemistry). f, g Reproduced with permission¹⁷⁰ (Copyright 2019, American Chemical Society). h–j Reproduced with permission¹⁷¹ (Copyright 2019, WILEY-VCH).