SnO2/TAPP复合薄膜光波导传感器的气敏性研究

Study on gas sensitivity of tin dioxide/tetraaminophenyl porphyrin composite film optical waveguide sensor

硫化氢(H2S)是工业废气的主要成分之一,在空气中痕量H2S气体都会对人体健康造成严重危害,因此,有效地检测H2S气体至关重要。利用旋转甩涂法分别将SnO2粉末和5、10、15、20-(四-4-氨基苯基)卟啉(TAPP)固定在K+离子交换光波导元件表面,制备了SnO2/TAPP复合薄膜光波导(OWG)气体传感器(SnO2/TAPP-OWG),在室温下对H2S气体进行了检测,并考察了旋转速度和TAPP溶液浓度对SnO2/TAPP-OWG传感器气敏性的影响。实验结果表明,当旋转速度为1 100 r/min并TAPP溶液百分质量浓度为0.42%时,SnO2/TAPP-OWG传感器对H2S的响应最佳,并能够检测1×10-11(V/V0)的H2S气体。当SnO2/TAPP-OWG暴露于1×10-9(V/V0)的H2S气体时,响应时间和恢复时间分别为2.7和50 s,具有良好的重复性,并且相对标准偏差(RSD)值为3.00%。

Hydrogen sulfide(H2S) is one of the main components of industrial waste gas. Trace amounts of H2S gas in the air may bring serious harm to human health. Therefore, how to detect H2S gas effectively is very meaningful. In this study, SnO2 and 5, 10, 15,20-(tetra-4-aminophenyl) porphyrin(TAPP) are coated onto potassium ion exchange glass optical waveguide(OWG) surface by utilizing the spin coating method. In this way, SnO2/TAPP composite thin film based OWG(SnO2/TAPP-OWG) sensor is realized, which can be used for H2S gases detection. SnO2/TAPP-OWG sensor device is tested under different mass concentrations of TAPP solution and rotating speeds of spin coater. Experimental results show that SnO2/TAPP-OWG sensing device fabricated at 1 100 r/min with 0.42% of mass concentration of TAPP solution shows best response to H2S gases. SnO2/TAPP-OWG sensor can measure the concentration of H2S gas as low as 1×10-11(V/V0) level, and reveals a good repeatability for 1×10-9(V/V0) of H2S gas with the fast response(2.7 s) and recovery time(50 s) at room temperature. The sensor has good repeatability and its RSD value is 3.00%.