fig3

Figure 3. (A) the micro-vertebral structure and basic properties of the P(VDF-TrFE) sensor^[60]; (B) the morphology of a conical array of interlaced microstructures that mimic the surface of a plant and the analysis of the sensing array on the stress distribution during a handshake^[61]; (C) the piezoelectric fiber structure and sensor device characteristics^[62]. PI: Polyimide; P(VDF-TrFE): poly(vinylidenefluoride-co-trifluoroethylene); PDMS: polydimethylsiloxane; PTFE: polytetrafluoroethylene; AgNWs: silver nanowires; PVDF: polyvinylidene fluoride; NFMs: nanostructured functional materials.