Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 44, Pages 52850-52860Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c10805
Keywords
NH3 sensor; flower NiWO4; MWCNTs; heterojunction; high sensitivity
Funding
- Jilin University State Key Laboratory open project [2019-15]
- Chengdu Normal University [2019CS19ZA0]
- National undergraduate training program for innovation and entrepreneurship [S2020143890147]
- National Natural Science Foundation of China [62074027]
- Henry Samueli School of Engineering and Applied Science
- Department of Bioengineering at the University of California, Los Angeles
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The study successfully synthesized NiWO4 microflowers with a large surface area and porous structure, and formed composites with MWCNTs for NH3 detection, showing excellent sensing performance attributed to the large surface area and heterojunction structure.
NiWO4 microflowers with a large surface area up to 79.77 m(2).g(-1) are synthesized in situ via a facile coprecipitation method. The NiWO4 microflowers are further decorated with multi-walled carbon nanotubes (MWCNTs) and assembled to form composites for NH3 detection. The as-fabricated composite exhibits an excellent NH3 sensing response/recovery time (53 s/177 s) at a temperature of 460 degrees C, which is a 10-fold enhancement compared to that of pristine NiWO4. It also demonstrates a low detection limit of 50 ppm; the improved sensing performance is attributed to the porous structure of the material, the large specific surface area, and the p-n heterojunction formed between the MWNTs and NiWO4. The gas sensitivity of the sensor based on daisy-like NiWO4/MWCNTs shows that the sensor based on 10 mol % (MWN10) has the best gas sensitivity, with a sensitivity of 13.07 to 50 ppm NH3 at room temperature and a detection lower limit of 20 ppm. NH3, CO2, NO2, SO2, CO, and CH4 are used as typical target gases to construct the NiWO4/MWCNTs gas-sensitive material and study the research method combining density functional theory calculations and experiments. By calculating the morphology and structure of the gas-sensitive material NiWO4(110), the MWCNT load samples, the vacancy defects, and the influence law and internal mechanism of gas sensitivity were described.
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