fig4

Figure 4. Human application testing of the sensor. (A-D) Relative resistance variety of the fabric strain sensor fixed on finger, wrist, elbow and knee joint; (E) Response signals recorded during speaking “Hello” and (F) “Good morning” respectively; (G) Photography of the strain sensor attached to the wrist and connected to a wireless monitoring system; (H) pulse monitoring. Illustration: The resistance signal of one pulse beat; (I) ECG signals obtained from the graphene-CNTs-TPU/fabric electrodes and Ag/AgCl electrodes. ECG: Electrocardiogram; CNTs: carbon nanotubes; TPU: thermoplastic polyurethane.