Fig. 5: Skin-interfaced wireless microgrid system based on strain-invariant MXene devices.

a Optical images of an on-body test of a participant wearing the wireless sos-MXetronics. The collected data were wirelessly sent to a smartphone and displayed in the custom-developed mobile app. Scale bar: 5 cm. b Block diagram of the electronic system of the sos-MXetronics. c Photographs demonstrating the mechanical compliance of the sos-MXetronics when stretching. Scale bar: 1 cm. d Working capacity of each MXene component under strain in sos-MXetronics, as well as its ability to continue functioning without external energy supply. e Photograph of the sos-MXetronics on the wrist for the detection of physiological signals. Scale bar: 2.5 cm. f Pulse signals obtained from the sos-MXetronics and strain-sensitive MXene device. The arterial pulse signal is wirelessly disconnected when the antenna is stretched to 20% in strain-sensitive MXene device. g Continuous wavelet transforms of pulse signals. h Schematic diagram of blood flow and the process of provoking the sensor to generate response. i Typical pulse waveform of the radial artery collected by one P-sensor. j Feature data extracted from pulse signals collected with and without strain. k SBP, DBP, and temperature monitoring throughout the day via sos-MXetronics. The error bars represent the mean ± standard deviation (n = 4 independent experiments).