Detection of Indoor Formaldehyde Concentration Using LaSrFeO₃-Doped SnO₂ Gas Sensor

Abstract:

Formaldehyde gas sensors with a structure of ceramic tube were fabricated by using La0.8Sr0.2FeO3-doped nanometer tin oxide. The highest response to formaldehyde appeared when the heating temperature of the La0.8Sr0.2FeO3-doped SnO2 sensor was about 370 °C. The response of the sensors to formaldehyde was measured in a gas concentration in the range of 0 - 5 ppm. The lowest formaldehyde concentration detected by 2 wt % (weight ratio) of La0.8Sr0.2FeO3-doped SnO2 gas sensor was 0.05 ppm. The response and recover times of the sensor to 0.5 ppm formaldehyde were about 120 s and 100 s, respectively. The response of the sensor to some interferent gases was tested.

• Periodical: Key Engineering Materials (Volume 437)
• Pages: 349-353
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.437.349
• Online since: May 2010
• Authors: Jing Wang, Xing Ru Chen, Peng Jun Yao, Min Ji, Jin Qing Qi, Wei Wu
• Keywords: Detection, Formaldehyde, Gas Sensor, TiN Oxide

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