P3HT/surfactant blend films in organic thin-film transistors for high-performance NO2 detection

Sihui Hou; Lin Gao; Junsheng Yu

doi:10.1117/12.2604748

13 December 2021 P3HT/surfactant blend films in organic thin-film transistors for high-performance NO₂ detection

Sihui Hou, Lin Gao, Junsheng Yu

Proceedings Volume 12075, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications; 1207503 (2021) https://doi.org/10.1117/12.2604748
Event: Tenth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2021), 2021, Chengdu, China

Abstract

The gas sensors based on organic thin-film transistor (OTFT) have drawn considerable attention due to the advantages of low-cost, flexible, and room-temperature operation. Herein, poly(3-hexylthiophene) (P3HT) blend with surfactants as an active layer for high-performance OTFT based nitrogen dioxide (NO2) sensors was reported. With the introduction of the surfactant (4-(1,1,3,3-Tetramethylbutyl)phenyl-polyethylene glycol, Triton), the gas sensors exhibited 7 times greater response to 30 ppm NO₂ than pure P3HT films. The studies in morphology of the blend film reveal that a large number of grain boundaries (GBs) are formed by introduction of surfactants, which can promote the diffusion of NO₂. In addition, the hydroxyl functional groups of the surfactants in blend films can efficiently adsorb polar molecules such as NO₂, thus enhance the sensing performance. The gas sensors also showed great potential for ultralow concentration detection with a response of 61% to 500 ppb, which are important for the practical applications. This work demonstrates that the surfactants can be applied to improve the NO₂ sensors with simple solution process, which expands the material choice of OTFT based gas sensors.

Citation Download Citation

Sihui Hou, Lin Gao, and Junsheng Yu "P3HT/surfactant blend films in organic thin-film transistors for high-performance NO₂ detection", Proc. SPIE 12075, 10th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Intelligent Sensing Technologies and Applications, 1207503 (13 December 2021); https://doi.org/10.1117/12.2604748

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