Figure 4.

Application of the flexible MoS₂ film strain sensor for health-related signals monitoring

(A–C) Pulse signal monitoring: (A) photograph, (B) real time, and (C) enlarged single cycle of a wrist pulse signal of a 29-year-old healthy man.

(D–F) Respiratory signal monitoring: (D) photograph, (E) real time, and (F) enlarged single cycle of a respiratory signal.

(G and H) Vocal cord signal monitoring: (G) photograph and (H) real-time vibration signals of “hello,” “flexible,” and “sensor.”