Citation:
LI Xin, LIU Cai-xia, ZHOU Jing-ran, MA Yan, RUAN Sheng-ping. Study on Ethanol Gas Sensor Based on Hierarchical Structured NiO/Zn2SnO4 Nanoflowers[J]. Chinese Journal of Analytical Chemistry,
;2022, 50(4): 564-573.
doi:
10.19756/j.issn.0253-3820.210880
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NiO/Zn2SnO4 hierarchical nanoflowers were successfully synthesized by hydrothermal method combined with subsequent solution impregnation process. Gas sensor with a side-heated gas sensor structure was fabricated by utilizing the obtained NiO/Zn2SnO4 as sensing material. Several characterization techniques such as X-ray diffraction(XRD) patterns, scanning electron microscopy(SEM), transmission electron microscope(TEM) and X-ray photoelectron spectroscopy(XPS) were employed to investigate the composition, morphology and microstructure of the samples. The results showed that the Zn2SnO4 synthesized via hydrothermal method took on a hierarchical nanoflower structure composed of nano-lamellae, and NiO was successfully decorated on the surface of the Zn2SnO4 nanoflowers as nanoparticles through solution impregnation. The gas sensing performances of pure Zn2SnO4 and NiO/Zn2SnO4 composites were investigated and the testing results revealed that the NiO/Zn2SnO4 composites exhibited excellent sensing performances to ethanol. The response presented a linear relationship with ethanol concentration in the range of 1-100 μL/L(R2=0.9990), the response to 100 μL/L ethanol reached 46.5 at 230℃, and the response and recovery time was 3 s and 16 s, respectively. Moreover, the NiO/Zn2SnO4-based sensor possessed great selectivity and stability. Compared with pure Zn2SnO4 nanoflowers, the sensing properties of NiO/Zn2SnO4 composites were improved dramatically, and the enhancement may ascribe to the p-n type heterojunctions formed between NiO and Zn2SnO4 as well as the catalysis synergetic effect of NiO. The research on the NiO/Zn2SnO4-based sensor provided a reference for highly sensitive detection of ethanol.
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Keywords:
- Zinc stannate,
- Nickel oxide,
- Heterostructure,
- Gas sensor,
- Ethanol
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