Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 47, Pages 44521-44527Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b15651
Keywords
organic thin-film transistor (OTFT); gas sensor; vertical phase separation; polymer blend; nitrogen dioxide (NO2)
Funding
- National Key R&D Program of China [2018YFB0407102]
- Foundation of National Natural Science Foundation of China (NSFC) [61421002, 61675041, 51703019]
- Project of Science and Technology of Sichuan Province [2019YFH0005, 2019YFG0121, 2019YJ0178]
- City University of Hong Kong [9610423]
- Research Grants Council of Hong Kong [CityU 11204717]
- Sichuan Province Key Laboratory of Display Science and Technology
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Formation of the semiconductor/dielectric double-layered films via vertical phase separations from polymer blends is an effective method to fabricate organic thin-film transistors (OTFTs). Here, we introduce a simple one-step processing method for the vertical phase separation of poly(3-hexylthiophene-2,5-diyl) (P3HT) and poly(methyl methacrylate) (PMMA) blends in OTFTs and their applications for high-performance nitrogen dioxide (NO2) sensors. Compared to the conventional two-step coated OTFT sensors, one-step processed devices exhibit a great enhancement of the responsivity from 116 to 1481% for 30 ppm NO2 concentration and a limit of detection of similar to 0.7 ppb. Studies of the microstructures of the blend films and the electrical properties of the sensors reveal that the devices formed by the one-step vertical phase separation have better capability for the adsorption of NO2 molecules. Moreover, a careful adjustment of the blend ratio between P3HT and PMMA can further improve the performance of the NO2 sensors, ranging from sensitivity to selectivity and to the ability of recovery. This simple one-step processing method demonstrates a potential possibility for developing high-performance, low-cost, and large-area OTFT gas sensors.
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