Design of Three Electrodes - Electrochemical Nitrogen Oxide Gas Sensors and Its Bias Characteristics

Abstract

Sensing nitrogen oxide gas is important for measuring pollution gas and detecting pollution sources in the atmosphere and for diagnosing diseases of human bodies through measuring NO₂ gas in the breathing process of human, and it needs to measure in the range of dilute concentration and develop measuring device in a less power-consuming electrochemical way. Even at very low gas concentrations, toxic gases including NO₂, SO₂, H₂S, and other S-containing gases have a number of detrimental impacts on human health. In industries including industrial plants, environmental monitoring, air quality assurance, automotive technology, and others, accurate gas detection at low concentrations is essential. The extensively researched sensing materials throughout the previous few decades were used to classify the most recent advancements in the detection of each of these dangerous gases. We designed the structure of three electrodes system (3ES)-electrochemical NO₂ gas sensor and analyzed the action principle based on Nafion membrane material by using the qualitative analysis method. We established the manufacturing process of the sensor and analyzed the bias voltage properties experimentally. So we presented that the optimal bias voltage range is 0.9~1.2V and sensitivity is 31μA/ppm. Also, it can sense NO₂ gas linearly up to 100ppm.