 Hybrid chemical resistive sensors have been developed as potential alternatives to traditional gas sensors due to their high responsiveness, selectivity, speed, stability, repeatability, low cost, and ease of fabrication. These sensors can be constructed from various combinations of different materials, such as heterojunctions, catalyst reactions, charge transfer, charge carrier transport, molecular binding or sieving. Each of these methods has its own advantages and disadvantages, but all offer the potential for improved performance over traditional gas sensors. The future direction of research into this area should focus on further refining existing techniques and developing new ones to maximize the potential of these sensors. This article was authored by Yingying Zhen, Wenwen Hu, Zhen Wanzhao, and others.