Research Progress of Magnetic Nanomaterials and Magnetic Field based Chemiresistive Gas Sensors

With the increasing demand for environmental protection and safety monitoring, the development of gas sensors with high sensitivity, fast response and selectivity is imperative. Magnetic field-assisted gas sensing is gradually becoming a research hotspot. This review aims to provide an overview of magnetic-related chemiresistive gas sensing from two segments, including magnetic sensing materials and magnetic field-assisted gas sensing. The type of sensors, the classification and parameters of magnetic materials, and the various materials employed in gas sensing are summarized. The review presents the currently commonly used methods for influencing magnetic structure and properties: chemical doping, defect engineering, and heterostructure construction as well as the application of applied magnetic field in gas sensing. This paper provides the first overview of chemiresistive gas sensors from a magnetic point of view, which is crucial for the development of magnetically correlated gas sensing technology and the subsequent study of the intrinsic mechanisms.