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New perspective on performance optimization of polymer low humidity sensor utilizing a conductive polymer template

Yunlong Yu,Wei Zhang,Yaping Song,Yanyu Cui,Sen Liu,Xishuang Liang,Teng Fei,Tong Zhang

In recent years, poly(ionic liquid)s (PILs) have attracted much attention for the application in humidity sensors. However, the ionic conductivity of PILs is inhibited in the low humidity range. In this work, discontinuous conductive template was prepared using a hydrophobic conductive polymer PEDOT:F, and PILs was prepared in situ on the conductive template (PFCT&PILs) to obtain a low humidity sensor. The prepared PFCT&PILs sensor has much lower impedance value, higher response and smaller detection limit than the pure PILs sensor. The PFCT&PILs sensor shows a high response of 208, with a small hysteresis of 0.5 % RH and has small impedance value in 5 %–35 % RH. The humidity sensitive principle of PFCT&PILs sensor has been discussed.