NO2-Affinitive Amorphous Conjugated Polymer for Field-Effect Transistor Sensor toward Improved NO2 Detection Capability
- Authors
- Chae, Huijeong; Han, Ji Min; Ahn, Yejin; Kwon, Ji Eon; Lee, Wi Hyoung; Kim, Bong-Gi
- Issue Date
- 2021-11
- Publisher
- WILEY
- Citation
- ADVANCED MATERIALS TECHNOLOGIES, v.6, no.11
- Abstract
- Three conjugated polymers (CPs) containing indolocarbazole-based similar conjugated frameworks are designed to investigate the NO2 detection capability of field-effect transistor (FET) sensors. The partly linear aliphatic side chain strengthens the crystallization tendency of the CPs, but the crystallinity is critically degraded when introducing an ethylene oxide (EO)-modified side chain to the same conjugated framework. Although the highly crystalline morphology of the CP helps to achieve high hole mobility, the NO2 response rate of the CP-based FET sensor is severely deteriorated because of the suppression of NO2 diffusion into the CP matrix. The polar and flexible EO-modified side chain is helpful to improve the NO2-affinity of the CPs and induce favorable pathways for NO2 diffusion, ultimately providing enhanced detectivity with better NO2-response characteristics. As a result, despite low charge carrier mobility due to pure amorphous nature, the CP with EO-modified side chains provides an exceptional sensitivity of 180%/ppm upon NO2 (100 ppb) exposure for 50 s, including distinct detectivity toward other environmentally abundant harmful polar gases, such as SO2, NO, and NH3.
- Keywords
- NITROGEN-DIOXIDE; AMMONIA; PERFORMANCE; MORPHOLOGY; NITROGEN-DIOXIDE; AMMONIA; PERFORMANCE; MORPHOLOGY; conjugated polymer; distinct detection; ethylene oxide side chain; field effect transistor; NO; (2) sensor
- ISSN
- 2365-709X
- URI
- https://pubs.kist.re.kr/handle/201004/116217
- DOI
- 10.1002/admt.202100580
- Appears in Collections:
- KIST Article > 2021
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