4.6 Article

Synthesis of Mesoporous Ag2O/SnO2 Nanospheres for Selective Sensing of Formaldehyde at a Low Working Temperature

Journal

ACS SENSORS
Volume 7, Issue 12, Pages 3963-3972

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acssensors.2c02232

Keywords

gas sensor; mesoporous metal oxide; self-template synthesis; polyphenol; formaldehyde

Funding

  1. National Natural Science Foundation of China [21701130, 22125501]
  2. National Key Research and Development Program [2022YFE0100400]
  3. Key Research and Development Program of Shaanxi [2021GY-225]
  4. Key Basic Research Program of Science and Technology Commission of Shanghai Municipality [20JC1415300]
  5. Heifei Advanced Computing Center

Ask authors/readers for more resources

The study demonstrated the fabrication of spherical mesoporous Ag2O/SnO2 sensing materials using silver/tin-polyphenol hybrid spheres as sacrificial templates. These materials exhibit uniform particle size, large pore size, high specific surface area, excellent response to formaldehyde at low temperatures, and exceptional selectivity towards interfering gases. Additionally, theoretical calculations suggest that the addition of Ag2O significantly enhances the adsorption energy towards formaldehyde, improving the overall sensing performance.
Formaldehyde (HCHO) is a prevalent indoor gas pollutant that has been seriously endangering human health. Developing semiconductor metal oxide (SMO) gas sensors for selective measurement of formaldehyde at low working temperatures remains a great challenge. In this work, silver/tin- polyphenol hybrid spheres are applied as a sacrificial template for the fabrication of spherical mesoporous Ag2O/SnO2 sensing materials. The obtained mesoporous Ag2O/SnO2 spheres have a uniform particle size (similar to 80 nm), large pore size (5.8 nm), and high specific surface area (71.3 m2 g-1). The response is 140 toward formaldehyde (10 ppm) at a low working temperature (75 degrees C). The detection limit reaches a low level of 23.6 ppb. Most importantly, it has excellent selectivity toward interfering gases. When the concentration of the interfering gas (e.g., ethanol) is 5 times as high as that of formaldehyde, the response is little affected. Theoretical calculations suggest that the addition of Ag2O can significantly enhance the adsorption energy toward formaldehyde, thus improving formaldehyde sensing performance. This work demonstrates an efficient self-template synthesis strategy for noble metal catalyst-decorated mesoporous metal oxide spheres, which could boost gas sensing performance at a lower working temperature.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available