Abstract
Simple fabrication and high environmental stability are eagerly desired for the practical use of temperature sensors in wearable healthcare devices. Herein, we present a fully-printed flexible temperature sensor based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) with high humidity stability. Using the novel bilayer passivation, which consisting of a fluorinated polymer (CYTOP) layer and a hydrophilic polyvinyl alcohol layer, resulting in a significant improvement in the humidity stability of the PEDOT:PSS-based sensing film. The fabricated sensor exhibited excellent stability under humidity ranging from 30% RH to 80% RH, and high sensitivity of −0.77% °C−1 for temperature sensing between 25 °C and 50 °C.
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