基于共价有机框架材料的QCM二氧化碳气体检测系统

QCM Carbon Dioxide Gas Detection System Based on Covalent Organic Framework Materials

为了实现人居环境下高精度二氧化碳气体检测,设计了一种基于共价有机框架材料COF-5的石英晶体微天平(QCM)二氧化碳气体传感器及检测系统。分析了QCM质量灵敏度分布原理并进行了有限元仿真分析,利用超声法合成敏感材料,采用滴涂法制备基于金电极的QCM二氧化碳气体传感器,并设计了一种基于FPGA的二氧化碳气体检测系统。实验测试结果表明:开发的二氧化碳气体传感器及检测系统在二氧化碳气体浓度为2000~5000 ppm下表现出良好的线性响应,拟合曲线相关系数为0.988,系统灵敏度为0.034 Hz/ppm,响应时间为32 s,恢复时间为20 s,表现出良好的动态响应性能,系统最大绝对误差小于±25 ppm,且系统具有较好的重复性及选择性。

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 2000~5000 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 systems maximum absolute error is less than±25 ppm,and it possesses good repeatability and selectivity.