研究目的
Investigating the effect of thermal modulation on the selectivity of TiO2-based resistive-type gas sensors for detecting various gases including H2, NO, NO2, CH4, and C3H8, and assessing cross-sensitivity and humidity interference.
研究成果
The array of TiO2:Cr sensors demonstrated sensitivity and selectivity to hydrogen, with good correlation between temperature modulation and sensor response. However, humidity significantly affects the sensor response to hydrogen. PCA analysis successfully distinguished between different concentrations of H2 and other gases, indicating the potential for reliable gas detection and classification.
研究不足
The study highlights the significant cross-sensitivity to humidity and interfering gases as a major drawback of resistive-type gas sensors. The need for discriminating between humidity and H2 is crucial for hydrogen detection.
1：Experimental Design and Method Selection:
The study focuses on the performance of an array of TiO2:Cr gas sensors under dynamic conditions with temperature modulation.
2：Sample Selection and Data Sources:
Nanocrystalline powders of TiO2 doped with chromium (
3：1 – 10 at.% Cr) were synthesized using Flame Spray Synthesis (FSS). List of Experimental Equipment and Materials:
The measuring system includes mass flow gauges from MKS Instruments, a resistance and humidity measuring unit, a temperature controller, and a PC computer.
4：Experimental Procedures and Operational Workflow:
Sensors were exposed to various target gases (H2, C3H8, CH4, NOx) within the concentration range of 0 – 3000 ppm at different relative humidity levels (0-50%RH) under temperature modulation.
5：Data Analysis Methods:
Principal Component Analysis (PCA) was used to differentiate between gas type and its concentration.
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