Figure 4.

(a) Optical image of the biodegradable EP sensor; (b) exploded view of the device; (c) photograph of a device attached to the chest to measure ECG; (d) ECG collected by a biodegradable sensor and a standard gel-based device; (e) photograph of EP sensor located in forearm to measure EMG; (f) EMG collected by a biodegradable sensor and a standard gel-based device; (g) dissolution process of the EP sensor immersed in PBS (pH = 10) at room temperature. Reproduced with permission from [24].