Journal
IEEE SENSORS JOURNAL
Volume 19, Issue 8, Pages 2855-2862Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2018.2890074
Keywords
Zinc oxide; polypyrrole; lead sulfide quantum dots; liquefied petroleum gas; SILAR method
Funding
- National Natural Science Foundation of China [51777215]
- Key Research and Development Plan Project of Shandong Province [2018GSF117002]
- Fundamental Research Funds for the Central Universities of China [18CX07010A]
- Open Fund of Key Laboratory of Marine Spill Oil Identification and Damage Assessment Technology, State Oceanic Administration of China [201801]
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In this paper, a high-performance liquefied petroleum gas (LPG) sensor based on zinc oxide/polypyrrole/lead sulfide quantum dots (ZnO/PPy/PbS QDs) nanocomposite film was demonstrated, which was fabricated by layer-by-layer self-assembly and successive ionic layer adsorption and reaction technique. The nanostructure features of the as-prepared ZnO/PPy/PbS nanocomposite film were confirmed by various characterization techniques. The room temperature gas-sensing investigation of the ZnO/PPy/PbS QDs nanocomposite sensor was performed against LPG gas in a wide concentration range. The experimental results showed an outstanding response for LPG sensing at room temperature compared with previous reports, the response can reach 45.47% at 1000 ppm LPG. And it also demonstrated good selectivity and excellent repeatability. The sensing mechanism of the PPy/ZnO/PbS QDs nanocomposite film gas sensor is owing to the p-n heterojunction created at the ZnO/PPy interface, as well as much more active adsorption sites.
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