Preparation of conjugated polymer/reduced graphene oxide nanocomposites for high-performance volatile organic compound sensors
- Authors
- Cheon, Hyeong Jun; Shin, Seo Young; Van Tran, Vinh; Park, Byoungnam; Yoon, Hyeonseok; Chang, Mincheol
- Issue Date
- Dec-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Conjugated polymers; Poly(3-hexylthiophene); Reduced graphene oxide; Nanocomposites; Volatile organic compounds; Gas sensors
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.425
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 425
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/84559
- DOI
- 10.1016/j.cej.2021.131424
- ISSN
- 1385-8947
- Abstract
- We have reported a facile approach to fabricate poly(3-hexylthiophene)/reduced graphene oxide (P3HT/rGO) composite films via the photoirradiation of the corresponding composite solutions. The films are applied to organic field-effect transistor (OFET) sensors for the high-performance detection of volatile organic compounds (VOCs). The photoirradiation of the composite solutions and the presence of rGO act synergistically to facilitate the molecular ordering of P3HT. Thus, the P3HT/rGO composite films containing 20 wt% rGO exhibit a maximized charge carrier mobility of similar to 0.18 cm(2) V-1 s(-1), which is 6-folds higher than that of pristine P3HT films. The interfacial interactions between rGO and P3HT are enhanced by the favorable pi-pi and electrostatic interactions following photoirradiation. The OFET sensors based on the P3HT/rGO composites consistently show enhanced sensitivity to polar VOCs (methanol, acetone, ethanol, and isopropyl alcohol) compared to those based on the pristine P3HT, photoirradiated bare P3HT, and pristine P3HT/rGO composites. In particular, the photoirradiated P3HT/rGO-based OFET sensors achieve significantly improved responsivity (similar to 110.6%) to methanol vapors (10 ppm) under rapid on/off pulses of 60 s, compared to those based on pristine P3HT (similar to 6.8%), photoirradiated bare P3HT (similar to 20.8%), and pristine P3HT/rGO (similar to 55.1%) composites. Finally, excellent response and recovery behaviors (e.g., similar to 15 s and similar to 42 s, respectively) are also observed.
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