fig4

Figure 4. Sensing properties of the 3D printed PEDOT:PSS-PVA strain sensing device. (A) Relative resistance variation of the sensing devices at large strain (0%-300%); (B) The sensing device with linearity (R² = 0.98) and hysteresis (0.4) within the 0%-300% strain range; (C) Response time of the sensing device at 0%-300% of a cyclic strain; (D) Change in relative resistance of this sensing device at different frequencies for the same time and strain conditions (50%); (E) Resistance to stress interference. The inset displays a sample of the device under uniaxial tension (~50%) and hammering, respectively; (F) Torsion resistance. The insets illustrate a sample of the device under uniaxial stretching (~250%) and manual torsion conditions, respectively; (G) Comparison of the performance of PEDOT:PSS-PVA-based strain sensing devices (stretchability, cyclic stability, and sensitivity); (H) Cycling stability at a strain of 100% within 3,000 cycles. PEDOT:PSS: Poly(3,4-ethylenedioxythiophene):polystyrene sulfonate; PVA: polyvinyl alcohol.