Flexible electronic
devices with strain
sensing and energy storage functions integrated simultaneously are
urgently desirable to detect human motions for potential wearable
applications. This paper reports the fabrication of a cotton/carbon
nanotube sheath–core yarn deposited with polypyrrole (PPy)
for highly multifunctional stretchable wearable electronics. The microscopic
structure and morphology of the prepared sheath–core yarn were
characterized by scanning electron microscopy and Fourier transform
infrared spectrometry. A mechanical experiment demonstrated its excellent
stretchable capacity because of its unique spring-like structure.
We demonstrate that the sheath–core yarn can be used as wearable
strain sensors, exhibiting an ultrahigh strain sensing range (0–350%)
and excellent stability. The sheath–core yarn can be used in
highly sensitive real time monitoring toward both subtle and large
human motions under different conditions. Furthermore, the electrochemical
performance of the sheath–core yarn was characterized by cyclic
voltammetry, galvanostatic charge–discharge, and electrochemical
impedance spectroscopy. The measured areal capacitance was 761.2 mF/cm2 at the scanning rate of 1 mV/s. The method of spinning technology
may lead to new exploitation of CNTs and PPy in future wearable electronic
device applications.
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