Synergistic Effects of Photoactivation and Photothermal in MXene Heterostructures for the Enhanced H 2 S Detection Capability

作者：Yutong Han, Ziyang Yin, Haozhe Zhuang, Yu Yao, Yu Ying, Xingyu Huang, Ze Long, Zhigang Zhu · 发表于：Advanced Functional Materials · 年份：2025 · DOI：10.1002/adfm.202509735 · 被引用次数：21 · 研究领域：MXene and MAX Phase Materials、Gas Sensing Nanomaterials and Sensors、Advanced Photocatalysis Techniques

Abstract Semiconductor‐based H 2 S gas sensors offer promising applications in human health detection, food monitoring, and industrial safety. Designing novel sensitive materials and coupling regulation mechanisms is crucial to achieving excellent response and response/recovery speed for room‐temperature gas sensors. Herein, MXene/PbS heterostructures dual‐modulated by visible‐light activation and photothermal catalysis are proposed. Under near‐infrared light activation, MXene/PbS sensor achieves a significant response value (90%, threefold higher than in dark conditions) for 10 ppm H 2 S, which also demonstrates rapid response/recovery kinetics (2 s/89 s), broad detection range (10 ppb–50 ppm), long‐term stability (60 days), and excellent selectivity. Experimental and theoretical calculations reveal that the enhanced sensing performance of MXene/PbS arises from improved near‐infrared light absorption and efficient photogenerated carrier separation by the constructed heterostructures, which promotes the dynamic generation of reactive radicals (·O 2 − , ·OH) on the sensitive material, and reduces the activation energy of H 2 S. Further, the self‐generated photothermal effectively promotes the response and recovery speeds of the MXene/PbS sensor. Eventually, an intelligent monitoring system integrating MXene/PbS sensors and deep learning algorithms is successfully applied to human oral health diagnosis and egg spoilage warning, providing novel strategies for gas sensing mechani...