基于COOH/SBA-15的谐振式氨气传感器气敏性能研究

针对化工生产过程中易出现的氨气泄露等问题,采用共聚法合成了羧基功能化介孔硅材料(COOH/SBA-15),并将其作为敏感材料设计了一种石英晶体微天平(Quartz Crystal Microbalance,QCM)式氨气传感器.利用扫描电子显微镜、透射电子显微镜、X射线衍射仪、全自动比表面积和孔隙度分析仪、傅里叶变换红外光谱仪等对敏感材料的形貌和结构进行了表征,并系统地研究了基于COOH/SBA-15的QCM传感器的气敏性能.测试结果表明该传感器对氨气(NH3)的检测限可达到10-6(体积分数),所合成的COOH/SBA-15-2样品对体积分数为20×10-6的NH3响应恢复时间分别为5s和7s.同时,该传感器对NH3具有较高的化学选择性和稳定性,具有较高的实用价值.

High performance QCM ammonia sensor based on COOH/SBA-15

Novel quartz crystal microbalance(QCM)based ammonia sensors were designed to prevent the leakage of ammonia in the chemical industry.The carboxyl-functionalized mesoporous silicas(COOH/SBA-15)synthesized by co-condensation methods were employed as the sensitive materials.Subsequently,the morphology and structure of the sensitive materials were characterized by means of scanning electron microscopy,transmission electron microscopy,X-ray diffraction,automatic surface area and porosity analysis and fourier transform infrared spectroscopy.The QCM sensor based on COOH/SBA-15-2 showed that the limit of detection to ammonia(volume fraction)could reach 10-6 level.The response and recovery time to20×10-6 ammonia was 5 sand 7 s,respectively.The results showed that the ammonia sensor was sensitive and stable accompanying with high practical value.