Fig. 3

a The schematic illustration of the SPST. b The photo image of the SPST. c The stretching schematic graph of the SPST at the 100% strain. d The output voltage and e output current of the SPST at the periodic stretching-releasing cycles
a The schematic illustration of the SPST. b The photo image of the SPST. c The stretching schematic graph of the SPST at the 100% strain. d The output voltage and e output current of the SPST at the periodic stretching-releasing cycles