Figure 4.

Sensing performance of NTTF_n@fiber sensors and real‐time muscular movement and human motion detection. a) Real‐time response of a sensor upon application of a quasitransient step strain from 0% to 5%. Inset: Enlarged Figure showing the response time. b) Resistance change‐time plot for more than 20 000 stretch/release cycles at 0.6 s for each cycle with an applied strain of 2%. The testing apparatus is shown in Figure S11a (Supporting information). c) Real‐time variation in the relative resistance under repetitive stretching from ε = 5% to ε = 20% at different frequencies. d–f) Response to motions of d) arm muscle with different gestures, e) the throat when drinking, and f) the knee joint. The NTTF_n@fiber sensor used was encapsulated by spray coating a thin (≈50 nm) TPE film on a relaxed fiber sensor, which did not have a significant effect on the sensors performance. Parameters of the tested strain sensor: ε_pre = 500%, n = 5, and h _s = 800 nm.