期刊
APPLIED NANOSCIENCE
卷 -, 期 -, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s13204-022-02560-0
关键词
rGO; NiMn2O4; rGO nanocomposite; CoMn2O4; rGO nanocomposite; Ammonia sensor; Wet impregnation method
资金
- King Saud University, Riyadh, Saudi Arabia [RSP-2021/267]
In this study, MMn2O4 and MMn2O4/rGO (M = Ni, Co) samples were successfully synthesized and characterized by XRD and FESEM analysis. Gas sensors for ammonia detection were fabricated, with CoMn2O4/rGO nanocomposite sample showing higher sensitivity and shorter response/recovery time. Tests on stability and selectivity were conducted, and the sensing mechanism of NH3 detection was discussed.
Herein, the MMn2O4 and MMn2O4/rGO (M = Ni, Co) samples were synthesized using co-precipitation and wet impregnation methods. XRD analysis showed the high purity and good crystallinity of the synthesized powders. FESEM analysis revealed the formation of pyramid-like structures and a good intimate mixture with rGO in the nanocomposite samples. Gas sensors were fabricated with pure and nanocomposite structures for the sensing of ammonia gas. The CoMn2O4/rGO nanocomposite sample achieved a higher sensitivity (S = 3.5) with shorter response/recovery (140 s/83 s) behavior in room temperature at 100 ppm of NH3. The stability and selectivity of the CoMn2O4/rGO nanocomposite gas sensor were examined. The preferable sensing mechanism of CoMn2O4/rGO nanocomposite towards the detection of NH3 was discussed.
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