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Time-Frequency Domain NO2-Humidity Sensor with Full-Range Tolerance Based on Pt Single-Atom Sensitized Nb2CTx Nanosheets
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DOI：10.1002/adma.202506463.png)
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Abstract
En 中文
Real-time in situ detection of NO2 is crucial for ensuring industrial safety and healthcare. However, conventional gas sensors face challenges from environmental humidity interference, limiting their reliability in practical applications. This study presents a dual-mode, full-range NO2-humidity sensing platform based on Pt single-atom-sensitized Nb2CTx nanosheets (Pt SA-Nb2CTx) integrated with TPU fiber mats (Pt SA-Nb2CTx@TPU). Combining resistive gas sensing and capacitive humidity sensing within a single device, this platform enables simultaneous NO2 and humidity detection with full-range humidity tolerance. The uniformly dispersed Pt single-atoms on the Nb2CTx nanosheets catalyze oxygen molecule dissociation and provide additional surface-active adsorption sites, achieving a 9.1-fold improvement in resistance response to 5 ppm NO2 and a 25.7-fold increase in capacitance response at 95% relative humidity. Importantly, the unaffected capacitive response allows precise calibration of NO2 concentration using resistance and capacitance, ensuring accurate NO2 detection across diverse and fluctuating humidity. Leveraging time- and frequency-domain NO2-humidity sensing capability, the Pt SA-Nb2CTx@TPU sensor is successfully integrated into self-designed functional modules to realize humidity tracking, industrial NO2 concentration alarming in full-humidity range as well as asthma prevention and alarm applications. This study offers a novel solution for humidity-compensated NO2 detection, advancing the applicability of gas sensors in complex and dynamic environments.
Keywords:
humidity compensation
multi-scenario applications
NO2-humidity sensing
Pt single-atom
room temperature detection