fig1

Figure 1. Island-bridge triboelectric sensor for cardiovascular monitoring. (A) Schematic illustration of the sensor’s structure design while attached to human fingertip for epidermal pulse monitoring; (B) Photo of the island-bridge configuration (Scale bar: 2 mm); (C) Operating mechanism of the sensor in single-electrode mode; (D) Schematic representation of the atomic potential energy distribution between FEP and PET films before contact, during contact, and separation. FEP: Fluorinated ethylene propylene; PET: polyethylene terephthalate.