Fig. 6: Piezoelectric response and sensing output.

a The piezoelectric coefficient d33 testing through quasi-static method. b The diagram of sandwich (4,4-DFPD)2GeBr4@TPU composite film and smart glove for gesture recognition. c Piezoelectric voltage output of the (4,4-DFPD)2GeBr4@TPU composite film. d The sensing signal output of gesture changing on five different fingers. e The different gesture changing from 1 to 4.