Fig. 3.

Multimodal on-skin electronics based on multiscale porous SEBS and spray-printed Ag NWs. (A) A photograph of the multimodal on-skin electronic patch, which was fabricated via the spray printing of Ag NWs on the multifunctional porous SEBS substrate. (B) Recorded alpha rhythm (Left), ECG signals (Middle), and EMG signals (Right). (C) Recorded EMG signals (Top) during electrical stimulations (Bottom). (D) Photographs, indicating the control of a soft robotic hand via EMGs recording. (E) Recorded skin temperatures (blue), which nearly overlaps with the data measured from a thermocouple (red). Here, a hot pad was applied to warm the skin to ∼45 °C before the test. Then an ice bag was used to accelerate cooling during the test. (F) Impedance variations as a function of frequency at the hydration levels of 99% (green), 88% (blue), 70% (red), and 67% (black). (G) Recorded skin hydration decay as a function of time after applying moisturizing lotion (red), which agrees well with the data measured from a commercial skin moisture sensor (black).