Thin film polypyrrole/SWCNTs nanocomposites-based NH3 sensor operated at room temperature |
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| Authors: | Nguyen Nguyen Quoc Phuong Dinh Tran Nguyen Duc |
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| Affiliation: | aInternational Training Institute for Materials Science (ITIMS), Hanoi University of Technology (HUT), No.1 Dai Co Viet Road, Hanoi, Viet Nam;bHanoi Advanced School Science and Technology(HAST), Hanoi, Viet Nam;cFaculty of Environment and Chemistry, Hung Yen University of Technology and Education, Hung Yen, Viet Nam;dInstitute of Engineering Physics (IEP), Hanoi University of Technology (HUT), Hanoi, Viet Nam |
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| Abstract: | A PPY/SWCNTs nanocomposite-based sensor with relatively high sensitivity and fast response–recovery was developed for detection of NH3 gas at room temperature. The gas-sensitive composite thin film was prepared using chemical polymerization and spin-coating techniques, and characterized by Fourier transformed infrared spectra and field-emission scanning electron microscopy. The results reveal that the conjugated structure of the PPY layer was formed and the functionalized SWCNTs were well-embedded. The effects of film thickness, annealing temperature, and SWCNTs content on gas-sensing properties of the composite thin film were investigated to optimize the gas-sensing performance. The as-prepared thin film PPY/SWCNTs composite sensor with optimized process parameters had a response of 26–276% upon exposure to NH3 gas concentration from 10 to 800 ppm, and their response and recovery times were around 22 and 38 s, respectively. |
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| Keywords: | Gas sensor Carbon nanotubes Polypyrrole Nanocomposite |
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