High-performance and self-calibrating multi-gas sensor interface to trace multiple gas species with sub-ppm level

• Published in: Sensors and actuators. B, Chemical Chemical, 2023-01, Vol.375, p.132939, Article 132939
• Main Authors: Kwon, Yeong Min, Oh, Byungjoo, Purbia, Rahul, Chae, Hee Young, Han, Gi Hyeon, Kim, Sun-Woo, Choi, Kyoung-Jin, Lee, Yunsik, Kim, Jae Joon, Baik, Jeong Min
• Format: Article
• Language: English
• Subjects: Functionalization; Next-generation gas sensors; Pattern recognition algorithm; Self-calibration; Sensor array
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2022.132939

Developing a better understanding of gas-metal oxide interactions as well as improving the output performance with the aging of the gas sensing array represents a critical challenge. In this work, we have designed a surface-functionalized metal-oxide sensors array containing six units for detecting NO2, SO2, H2S, and CO hazardous gases. The responses of the sensor array to four target gases are enhanced by various catalytic effects on the surface, and they show distinctive responses to each gas. For improved selectivity, a pattern recognition algorithm is implemented under an edge computing-based environment to relieve the overload of a monitoring server. Moreover, a self-calibration method for long-term stability is designed to indirectly calibrate gas responses with aging. With its edge-computing device prototype, which includes a sensor array and its readout integrated circuit, four target gases are distinguished by an artificial neural network algorithm with 97% accuracy. The present work describes the effective platforms for emerging next-generation gas sensors with improved communication and monitoring systems. [Display omitted] •Surface-functionalized metal-oxide sensors array for detecting NO2, SO2, H2S, and CO hazardous gases is fabricated.•The responses of the sensor array to four target gases are enhanced by various catalytic effects on the surface.•Pattern recognition algorithm with edge computing is implemented to relieve the overload of a monitoring server.•A self-calibration method for long-term stability is designed to indirectly calibrate gas responses with aging.•Four target gases are distinguished by an artificial neural network algorithm with 97% accuracy.