Body
temperature is an important indicator of human health.
The
traditional mercury and medical electronic thermometers have a slow
response (≥1 min) and can not be worn for long to achieve continuous
temperature monitoring due to their rigidity. In this work, we prepared
a skin-core structure polyurethane (PU)/graphene encapsulated poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate)
(PEDOT:PSS) temperature-sensitive fiber in one step by combining wet
spinning technology with impregnation technology. The composite fiber
has high sensitivity (−1.72%/°C), super-resolution (0.1
°C), fast time response (17 s), antisweat interference, and high
linearity (R
2 = 0.98) in the temperature
sensing range of 30–50 °C. The fiber is strong enough
to be braided into the temperature-sensitive fabric with commercial
cotton yarns. The fabric with good comfort and durability can be arranged
in the armpit position of the cloth to realize real-time body temperature
monitoring without interruption during daily activities. Through Bluetooth
wireless transmission, body temperature can be monitored in real-time
and displayed on mobile phones to the parents or guardians. Overall,
the fiber-based temperature sensor will significantly improve the
practical applications of wearable temperature sensors in intelligent
medical treatment due to its sensing stability, comfort, and durability.