Figure 3.

Electrical characterizations of the 3D flexible electronics. (a) The experimental surface tension and the theoretical surface tension after metal sputtering. (b) Stabilities of devices with channel metal sputtered and unsputtered. (c) Repeated stretch tests under different strains, namely 10%, 20%, 30%, 50%, 70%, 100%, 200%, 300%, 400%, 500%, and 600%. (d) The experimental and theoretical resistance values of sensor's resistance under tensile strain. (e) The stretching circuit channel. (f) Tactile durability test of Ecoflex sensor under a strain of 100% at a frequency of 0.1 Hz. The resistance change curves were recorded after every 1000 cycles, and 10 cycles of data are presented in each record.