Fig. 5.
Several applications of CNT-based strain sensor. a Resistance response of finger motion. b Resistance response of wrist motion. c Monitoring the movement of a robot knee. d The pulse signal of a volunteer. e Detection of human breath through a mask. f Resistance response of tiny change of air pressure. g Monitoring the human voice with the word “Carbon”.h Monitoring the human voice with the word “Nanotube”. i Monitoring the human voice with the word “Graphene”