抗溶胀壳聚糖基复合薄膜实现湿度传感器高灵敏快响应OA

Chitosan,as a bio-based material,combines environmental friendliness with excellent moisture adsorption capacity.However,its inherent high-humidity swelling characteristics often lead to issues such as,slow response and low long-term reliability in humidity sensors.To address these problems,a humidi-ty sensor based on chitosan-molybdenum disulfide composite material was proposed in this study,aiming to achieve high sensitivity and fast response.By incorporating two-dimensional molybdenum disulfide nanosheets into the chitosan matrix,a chitosan-MoS₂ composite humidity-sensitive film with a cross-linked network was constructed.Characterization and performance test results show that molybdenum disulfide nanosheets not only form a cross-linked network with chitosan through hydrogen bonding,but also con-struct a physical barrier layer,which effectively suppresses the swelling of the material under high humidi-ty conditions,and enhances the water molecule adsorption capacity and interfacial polarization effect of the film.The prepared chitosan-MoS2 sensor exhibits a wide operating humidity range(7%RH-95%RH),high sensitivity(14 200 pF/%RH),short response/recovery time(15/25 s),good repeatability(5 rela-tive standard deviation 2.08%over 5 cycles)and long-time stability(no attenuation over 120 h).Further-more,the sensor demonstrates potential application value in respiratory pattern recognition and non-con-tact human-computer interaction.This study provides an effective design and fabrication strategy for the development of high-performance and stable humidity sensors.