 Abstract chemi-resistive sensors based on hybrid functional materials have been identified as a promising candidate for gas sensing due to their high responsiveness, good selectivity, fast response slash recovery, great stability slash repeatability, room temperature operation, low cost, and ease of fabrication. These sensors can be categorized into five main forms, manipulation of heterojunctions, catalytic reactions, charge transfer, charge carrier transport, and molecular binding slash sieving. Each form has its own advantages and challenges, which are discussed in this paper. The authors also discussed the potential directions for further research and development of hybrid material-based gas sensors. This article was authored by Yingying Jian, Wenwen Hu, Zhenhuanzhao, and others.