Improved NO2 Gas-Sensing Performance of an Organic Field-Effect Transistor Based on Reduced Graphene Oxide-Incorporated Nanoporous Conjugated Polymer Thin Films
- Authors
- Shin, Seo Young; Jeong, Ganghoon; Phu, Nann Aye Mya Mya; Cheon, Hyeonseo; Tran, Vinh Van; Yoon, Hyeonseok; Chang, Mincheol
- Issue Date
- Sep-2023
- Publisher
- AMER CHEMICAL SOC
- Citation
- CHEMISTRY OF MATERIALS, v.35, no.18, pp.7460 - 7474
- Journal Title
- CHEMISTRY OF MATERIALS
- Volume
- 35
- Number
- 18
- Start Page
- 7460
- End Page
- 7474
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89237
- DOI
- 10.1021/acs.chemmater.3c00918
- ISSN
- 0897-4756
- Abstract
- In this study, we have described a simple method for enhancing the NO2-sensing performance of the organic field-effect transistor (OFET) sensors at room temperature through reduced graphene oxide (rGO)-incorporated nanoporous P3HT films using the shear coating-assisted phase separation technique. The morphologies, microstructures, photophysical properties, and electrical properties of rGO-incorporated nanoporous P3HT films were investigated by atomic force microscopy, optical microscopy, ultraviolet-visible spectroscopy, X-ray diffraction analysis, Raman spectroscopy, and charge-carrier mobility measurements. The synergistic effect of P3HT pores acting as analyte diffusion pathways and rGO acting as adsorption sites resulted in a significant variation of the electrical properties of nanoporous P3HT/rGO OFETs upon exposure to NO2 gas molecules, indicating the potential of OFETs as efficient NO2 sensors. Specifically, the new nanoporous OFET sensors based on rGO-incorporated nanoporous P3HT films exhibited significantly improved responsivity with a value of similar to 61.3% for 10 ppm NO2 gas compared to those based on nonporous P3HT/PS/rGO composite films (similar to 17.7%). Moreover, excellent response and recovery behaviors (response time = similar to 62 s and recovery time = similar to 145 s), high sensitivity (similar to 1.48 ppm(-1)), and good selectivity were observed.
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