Recent advances in different materials for moisture resistance of metal oxide-based gas sensors: A review

Abstract

Metal oxide-based gas sensors have aroused widespread exploration and application owing to their high response value, excellent selectivity, and excellent stability. However, damage from environmental humidity has become a bottleneck in gas detection applications, especially in trace breath sensing analysis. This review focuses on the research progress of different materials in applying moisture resistance gas sensors. First, the modification strategies of moisture resistance gas sensing materials including noble metal modification, heterojunction construction, and polymer nanocomposites are discussed, and the micromorphology of the resulting materials is analyzed. In addition, the application results and enhancement sensing mechanisms of different materials including noble metals, metal oxides, zeolitic imidazolate framework, polymers, metal sulfides, and GO in moisture resistance sensors are summarized in detail. Finally, the challenges and prospects of metal oxide-based gas sensors in moisture resistance applications in the future are discussed in depth.