Abstract
Facile fabrication and high ambient stability are strongly desired for the practical application of temperautre sensor in real-time wearable healthcare. Herein, a fully printed flexible temperature sensor based on cross-linked poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) was developed. By introducing the crosslinker of (3-glycidyloxypropyl)trimethoxysilane (GOPS) and the fluorinated polymer passivation (CYTOP), significant enhancements in humidity stability and temperature sensitivity of PEDOT:PSS based film were achieved. The prepared sensor exhibited excellent stability in environmental humidity ranged from 30% RH to 80% RH, and high sensitivity of −0.77% °C−1 for temperature sensing between 25 °C and 50 °C. Moreover, a wireless temperature sensing platform was obtained by integrating the printed sensor to a printed flexible hybrid circuit, which performed a stable real-time healthcare monitoring.
Highlights
Many efforts have been made to develop flexible temperature sensors, which mainly contain three types: pyroelectric detectors[7,8], resistive temperature detectors (RTDs)[9,10], and thermistors[11]
In contrast to its counterparts, PEDOT:PSS has been proven as a promising candidate for the wearable temperature sensor, owing to its outstanding mechanical properties and turntable electrical characteristics, and the superior in simple, patternable, and high reproducible fabrication, such as printing[21,22]
As a water-soluble polymer, the resistance of PEDOT:PSS be affected by the environmental humidity, which would cause cross-talk with temperature[23,24]
Summary
Many efforts have been made to develop flexible temperature sensors, which mainly contain three types: pyroelectric detectors[7,8], resistive temperature detectors (RTDs)[9,10], and thermistors[11]. Various thermistor materials have been developed and investigated, including composites of conductive filler with polymer, and temperature sensing conductive materials such as silver nanowire (AgNW)[14,15], carbon nanotubes (CNTs)[16], reduced graphene oxide (rGO)[17,18], and poly( 3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)[19,20]. Most of these studies focused on improving the sensitivity and mechanical performance of temperature sensors, while their ambient stability, especially humidity stability, has rarely been considered. A wireless temperature sensing platform with the functions of on-site signal acquisition, condition, and data transmission was achieved by integrating the printed sensor to a printed flexible hybrid circuit, which performed a stable real-time body temperature monitoring
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