High-Performance Nitric Oxide Gas Sensors Based on an Ultrathin Nanoporous Poly(3-hexylthiophene) Film

Conjugated polymer (CP)-based organic field-effect transistors (OFETs) have been considered a potential sensor platform for detecting gas molecules because they can amplify sensing signals by controlling the gate voltage. However, these sensors exhibit significantly poorer oxidizing gas sensing perf...

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Bibliographic Details
Published in:Biosensors (Basel) 2023-01, Vol.13 (1), p.132
Main Authors: Jeong, Ganghoon, Shin, Seo Young, Kyokunzire, Proscovia, Cheon, Hyeong Jun, Wi, Eunsol, Woo, Minhong, Chang, Mincheol
Format: Article
Language:English
Subjects:
Adsorption
Air pollution
Data acquisition systems
Etching
Field effect transistors
gas sensor
Gas sensors
Gaseous diffusion
Metal oxides
Nanopores
nanoporous conjugated polymer film
Nitric Oxide
organic field-effect transistor
Oxidation
Phase separation
Poly A
poly(3-hexylthiophene)
Polymer blends
Polymers
Room temperature
Semiconductor devices
Sensors
Solvents
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Summary:Conjugated polymer (CP)-based organic field-effect transistors (OFETs) have been considered a potential sensor platform for detecting gas molecules because they can amplify sensing signals by controlling the gate voltage. However, these sensors exhibit significantly poorer oxidizing gas sensing performance than their inorganic counterparts. This paper presents a high-performance nitric oxide (NO) OFET sensor consisting of a poly(3-hexylthiophene) (P3HT) film with an ultrathin nanoporous structure. The ultrathin nonporous structure of the P3HT film was created via deposition through the shear-coating-assisted phase separation of polymer blends and selective solvent etching. The ultrathin nonporous structure of the P3HT film enhanced NO gas diffusion, adsorption, and desorption, resulting in the ultrathin nanoporous P3HT-film-based OFET gas sensor exhibiting significantly better sensing performance than pristine P3HT-film-based OFET sensors. Additionally, upon exposure to 10 ppm NO at room temperature, the nanoporous P3HT-film-based OFET gas sensor exhibited significantly better sensing performance (i.e., responsivity ≈ 42%, sensitivity ≈ 4.7% ppm , limit of detection ≈ 0.5 ppm, and response/recovery times ≈ 6.6/8.0 min) than the pristine P3HT-film-based OFET sensors.
ISSN:2079-6374
2079-6374
DOI:10.3390/bios13010132