What is a Formaldehyde Sensor?
The BA6208 formaldehyde sensor is specifically designed for the detection of formaldehyde gas (CH2O) based on the principle of electrochemical reaction. During the process of house decoration, a substantial amount of formaldehyde gas is often present. It is a colorless, irritating organic compound that has a stimulating effect on the eyes and nose, posing significant harm to human health. On October 27, 2017, formaldehyde was classified as a Group 1 carcinogen by the International Agency for Research on Cancer, a part of the World Health Organization. On July 23, 2019, formaldehyde was listed as a toxic and harmful water pollutant. Therefore, detecting formaldehyde gas is of paramount importance.
Methods and Principles of Formaldehyde Gas Detection
Domestically and internationally, methods for detecting formaldehyde gas in living rooms, textiles, and the food industry primarily include: spectrophotometry, colorimetry, liquid chromatography, phenol reagent method, and electrochemical sensor method. The electrochemical formaldehyde sensor employs a 4-electrode configuration, including a working electrode and an active auxiliary electrode. The signal from the auxiliary electrode is mainly used for temperature compensation, commonly employed to enhance the sensor's selectivity, which is directly proportional to the concentration of formaldehyde in the air.
Characteristics and Applications of Formaldehyde Sensors
Characteristics: High sensitivity, high resolution, low power consumption, long service life, high stability, excellent resistance to interference, and outstanding linear output. Applications: Portable instruments, air quality monitoring devices, air purifiers, ventilation systems, air conditioning, smart home equipment, and other environments.
Development of Formaldehyde Sensors
Since formaldehyde primarily exists in the form of gas, its detection mainly focuses on formaldehyde gas. Existing formaldehyde sensors lack high selectivity, thus enhancing the selectivity of formaldehyde sensors will be a future research direction. Due to the hazards of formaldehyde, improving its sensitivity, detection limit, and recovery response characteristics are also crucial. Moreover, reducing the size of formaldehyde sensors to achieve miniaturization is a key research area. To enhance the comprehensive performance of formaldehyde gas sensors, on one hand, better gas-sensitive materials need to be found and production processes improved; on the other hand, the integration of various sensors is necessary, though it may increase size and cost, making size and cost reduction a significant research focus.
Previous: Trade Shows Pulse Sensor Attended in 2021
Next: Advancements in Carbon Nanotube-Based Hydrogen Gas Sensors: Applications, Principles, and Prospects
