Nanoporous polymer films based on breath figure method for stretchable chemiresistive NO2 gas sensors

作者：Liu, Changjian; Wu, Mengge; Gao, Lin; Liu, Hao; Yu, Junsheng^*

来源：Sensors and Actuators, B: Chemical , 2022, 371: 132540.

DOI：10.1016/j.snb.2022.132540

• Breath figure
• Transfer printing
• Wearable electronics
• Stretchable gas sensors
• Nanoporous polymer film

Wearable electronics targeting toxic gas analytes have raised tremendous concerns for human-centric intelligent healthcare electronics and systems. A remaining challenge is to combine excellent sensing performance with good mechanical robustness, which has limited the practical applications. Here, we report stretchable, hyper-sensitive chemiresistive gas sensors based on the breath figure strategy and the transfer printing technique. In a demonstration of the Poly(3-hexylthiophene-2,5-diyl) (P3HT) @ polystyrene-block-poly(ethylene-ran-butylene)-block-polystyrene (SEBS) composite film/serpentine Au electrode, sensitivity up to 467 ppm(-1), the ultralow limit of detection of 2.45 ppb, and a gas detection stability at 40 % tensional strain were achieved due to the more active sites and stress dispersion provided by the porous structure of the P3HT@SEBS composite film. To demonstrate the universality of this breath figure strategy, porous polymer diketopyrrolopyrrole-thieno[3,2-b] thiophene (DPPT-TT) was utilized to build stretchable NO2 sensors. This work reveals that the porous structure could enhance considerable sensing and stretchable properties of gas sensors, and provide a general solution for more stretchable wearable electronics.

• 单位
  电子科技大学