QCM Carbon Dioxide Gas Detection System Based on Covalent Organic Framework Materials
In order to achieve high-precision carbon dioxide(CO2)gas detection in indoor environments,a quartz crystal mi-crobalance(QCM)CO2 gas sensor and detection system based on the covalent organic framework material COF-5 were de-signed.The principle of QCM quality sensitivity distribution was analyzed,and a finite element simulation analysis was conduc-ted.Using the ultrasonic method to synthesize the sensitive material,a QCM CO2 gas sensor based on gold electrodes was prepared using the drop-coating method.Additionally,a CO2 gas detection system based on FPGA was designed.Experimental results indi-cate that the developed CO2 gas sensor and detection system exhibit excellent linear response in the concentration range of 2 000～5 000 ppm of CO2,with a correlation coefficient of 0.988 for the fitted curve.The system sensitivity is 0.034 Hz/ppm,response time is 32 seconds,recovery time is 20 seconds,demonstrating excellent dynamic response performance.The system's maximum absolute error is less than±25 ppm,and it possesses good repeatability and selectivity.
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