Fig. 5: Application of Janus adhesive tape in skin adhesion.

a Janus adhesive tape shows a high transparency of almost 90%. The inset image shows an optical photograph of the Janus adhesive tape. b The Janus adhesive tape can be dyed different colors. By attaching a strain sensor to the pulse point through Janus adhesive tape (c), the frequent bending motions of the wrist can be accurately monitored (d)