Abstract: Addressing the issues of low sensitivity in p-type semiconductor materials for gas sensors and the need for enhancement in the low-temperature detection performance and gas selectivity of CuO-based gas sensing materials,this review aims to summarize the research progress on CuO-based heterostructured materials in the field of gas sensors,providing theoretical guidance for the targeted design of gas-sensitive materials. The review focuses on strategies for improving the performance of pristine CuO materials by constructing heterostructures with various materials such as metal oxides and metal sulfides,while analyzing the associated sensitization mechanisms. Studies demonstrate that constructing heterostructures can significantly enhance the gas-sensing performance of pristine CuO materials,not only improving the sensitivity and selectivity of sensors toward target gases but also enabling rapid response at low operating temperatures. Meanwhile,the application of CuO-based heterojunction materials in fields such as environmental monitoring and industrial safety has been promoted. CuO-based heterostructures can effectively improve gas-sensing performance through composite construction,and the summary of their sensitization mechanisms provides theoretical support for the targeted design of gas-sensitive materials,exhibiting significant research value and application prospects. 

Key words: copper oxide,heterojunction,metal sulfide,gas sensing ,