Recent progress in chemiresistive gas sensors with 1D nanostructured sensing materials: Insights into the structure-morphology-performance relationship

Chemiresistive gas sensors have gained popularity in various fields including industry, agriculture, medical treatment, and the environment, thanks to the advancements in nanoscience and nanotechnology. To produce high-performance gas sensing devices, it is crucial to develop new sensing layers. Among zero to three-dimensional nanostructures, one-dimensional (1D) nanostructures have attracted significant attention due to their large surface-to-volume ratio, stretchable charge channels, and favorable assembly environment. This review aims to systematically discuss recent advances in novel sensing materials based on 1D nanostructures such as nanorods, nanoribbons, nanowires, nanofibers, and nanotubes. The 1D sensing materials encompass metal oxide semiconductors, metal-organic frameworks, conducting polymers, carbon-based materials, and complex composites. The review also delves into the design ideas, preparation methods, the relationship between structure, morphology and performance, and enhanced sensing mechanisms. Finally, the review summarizes the current state of the art for chemiresistive gas sensors based on 1D nanostructures and provides a brief outlook on future development perspectives.