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Large-lateral-area SnO2 nanosheets with a loose structure for high-performance acetone sensor at the ppt level
Chunyan Li1, Pil Gyu Choi1, Yoshitake Masuda1
1National Institute of Advanced Industrial Science and Technology (AIST), 4-205 Sakurazaka, Moriyama, Nagoya, Aichi 463-8560, Japan.
Journal of Hazardous Materials
|May 11, 2023
Summary
Researchers developed a novel tin oxide (SnO2) nanosheet sensor for highly sensitive and selective acetone detection. This breakthrough offers a new standard for gas sensing technology, particularly in clinical diagnostics and environmental monitoring.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- High sensitivity and selectivity are crucial for gas sensors in applications like volatile organic compound detection, security alerts, and clinical diagnostics.
- Semiconducting tin oxide (SnO2) is a well-established gas-sensing material due to its responsiveness and stability.
- Existing SnO2 sensors often require complex synthesis methods or lack optimal performance characteristics.
Purpose of the Study:
- To synthesize a large-lateral-area SnO2 nanosheet with a loose structure for enhanced gas sensing.
- To evaluate the sensor's sensitivity, selectivity, and limit of detection for acetone.
- To investigate the factors contributing to the sensor's superior performance and stability.
Main Methods:
- A one-step, facile aqueous solution process was employed to synthesize SnO2 nanosheets without surfactants or templates.
- The synthesized SnO2 nanosheets were characterized for their structural and morphological properties.
- Gas sensing performance, including sensitivity, selectivity, limit of detection, anti-interference, reproducibility, and long-term stability, was tested using acetone at various concentrations.
Main Results:
- A large-lateral-area SnO2 nanosheet with a loose structure was successfully synthesized.
- The sensor demonstrated remarkable sensitivity (Ra/Rg = 1.33) at 40 parts per trillion (ppt) for acetone, with a theoretical limit of detection of 1.37 ppt.
- The sensor exhibited superior anti-interference ability compared to pristine SnO2 and commercial sensors, along with excellent reproducibility and 100-day stability.
Conclusions:
- The unique loose, large lateral area structure, small grain size, and metastable (101) crystal facets of the SnO2 nanosheets are responsible for the ultrasensitive acetone response.
- This novel SnO2 nanosheet sensor offers a significant advancement in gas sensing technology, particularly for acetone monitoring.
- The developed material holds great potential for practical applications requiring highly sensitive and selective gas detection.
