研究目的
Designing a strong sensitive gas sensor for sensing even extremely low concentrations of ppb-level NO2 (0–150 ppb) is important because NO2 is highly toxic to human nervous system and respiratory organs.
研究成果
The Au-Ag/MWCNTs/WO3 sensor exhibited superior NO2 gas-sensing properties under UV-LED irradiation, including high sensitivity, good linearity, short response time, and long-term stability. The enhancement was attributed to the synergistic effect of Ag and Au bimetal particles and UV-LED irradiation.
研究不足
The recovery of the sensors was rather slow due to the higher bonding energy between Au-Ag/MWCNTs/WO3 and NO2, making it difficult to detach NO2 from the sensor in a practical response time at room temperature.
1：Experimental Design and Method Selection
The methodology involved the fabrication of NO2 gas sensors using Ag, Au, and Au-Ag bimetal particles modified MWCNTs/WO3 composite. The effects of these modifications and UV-LED irradiation on the sensor's response to NO2 gas were studied.
2：Sample Selection and Data Sources
MWCNTs were incorporated into WO3 via a one-pot polyol process combined with metal organic decomposition (MOD) method. Ag, Au, and Au-Ag bimetal particles were deposited on the surface of MWCNTs/WO3 composite film using in-situ UV reduction technique.
3：List of Experimental Equipment and Materials
Equipment included UV-LED (365 nm), FE-SEM, EDS, TEM, XRD, and UV–Vis spectrometer. Materials included MWCNTs, WO3, AgNO3, HAuCl4, and sodium citrate.
4：Experimental Procedures and Operational Workflow
The process involved the preparation of MWCNTs/WO3 composite film, modification with Ag, Au, and Au-Ag bimetal particles, and characterization of the films. Gas-sensing properties were measured under UV-LED irradiation at room temperature.
5：Data Analysis Methods
The sensor response was calculated based on the change in electrical resistance when exposed to NO2 gas. The structural and optical properties of the films were analyzed using SEM, EDS, TEM, XRD, and UV–Vis absorption spectroscopy.
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