Materials for chemical resistance type gas sensors: VOCs identification

As a key technology for air quality monitoring and pollution control, advances in gas sensors have attracted considerable attention. Semiconductor resistive gas sensors with high cost performance, fast response and easy integration as the core advantages, become the “civilian solution” in the field of gas detection, especially suitable for large-scale deployment or portable application scenarios. In the contemporary scientific discourse, the classification of materials utilized in VOCs semiconductor gas sensing has evolved to encompass three primary categories: inorganic materials, organic materials and composite materials. Each category has unique advantages and is suitable for a specific range of applications. However, previous reviews on gas sensing materials only focus on one kind of materials and their gas-sensitive properties, without a comprehensive classification and summary of the advantages and disadvantages of various gas-sensitive materials, and lack of sensitization methods for various materials. This research presents a comprehensive review of the most recent advancements in the field of gas-sensitive materials. It offers a succinct analysis of the classification, working principles, sensing mechanisms, and performance parameters of gas sensors. This paper mainly classifies the main branches of semiconductor gas sensing materials and their sensitization method, and explains the sensitization principle. Finally, the intelligent development of gas sensor is prospected.