Improved ammonia gas sensing performance at room temperature of polypyrrole by polyoxometalate decoration

Here, we introduced polyoxometalate (POMs) into polypyrrole (PPy) gas sensitive material for the first time to restrain the electron-hole recombination process and enhance the gas sensing performances. At room temperature, the sensing response value of PPy/POMs composite nanoparticles to 100 ppm NH3...

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Veröffentlicht in:Polymer (Guilford) 2024-07, Vol.307, p.127306, Article 127306
Hauptverfasser: Chang, Zhuang, Wang, Tianqi, Pei, Wenyuan, Li, Feng, Yang, Ying, Shao, Hong, Li, Dan, Yin, Duanduan, Yu, Hui, Dong, Xiangting
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Sprache:eng
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Zusammenfassung:Here, we introduced polyoxometalate (POMs) into polypyrrole (PPy) gas sensitive material for the first time to restrain the electron-hole recombination process and enhance the gas sensing performances. At room temperature, the sensing response value of PPy/POMs composite nanoparticles to 100 ppm NH3 gas can be improved to 80.85 %, 2.99 times than that of pure PPy nanoparticles. PPy/3 % SiW12 sensor response-recovery time was 39 s/166 s. It had good linearity (R2 = 0.9958), the LOD of NH3 was 85 ppb. In 21 days, the sensor still maintained over 90 % of the initial ammonia response value. Selectivity, repeatability and other sensing parameters were systematically investigated. In addition, the mechanism of sensing performance enhancement was analyzed and discussed. The study proved that POMs can separate electrons and holes, finally improved gas sensing properties. This work provides a new idea for the design and construction of high sensitivity PPy-based gas sensor by introducting polyoxometalates. [Display omitted] •First demonstration of the influence of POMs on gas sensing performance of PPy.•The decoration of POMs enhanced the NH3 gas-sensing performance of PPy.•The PPy/x%SiW12 sensor exhibit a gas sensing response of 80.85 %–100 ppm NH3 gas.•The sensing response of composite is 2.99 times higher than pure PPy sensor.•The sensor shows excellent selectivity and long-term stability.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2024.127306