聚苯胺敏感膜声表面波氨气传感器

Polyaniline Sensitive Film SAW Ammonia Sensor

以聚苯胺作为敏感材料,实验制备了高灵敏快速响应的声表面波(SAW)氨气传感器器件,结合鉴相式传感电路,构建了传感系统。聚苯胺对氨气的选择性吸附所产生的质量负载及声电耦合效应引起声传播速度的变化,进而以鉴相器输出的电压信号来表征待测氨气体积浓度。实验结果表明,在室温工作条件下,传感器显示出高灵敏度(0.11 mV/10^(-6) mV)、低检测下限(0.5×10^(-6))及快速响应时间(T_(90)<20 s)。

Using polyaniline as a sensitive material,a highly sensitive and fast-response surface acoustic wave(SAW)ammonia gas sensor device was experimentally prepared,and a sensing system was constructed by combining with a phase-detecting sensing circuit.The mass load and the acoustic-electric coupling effect generated by the selective adsorption of polyaniline to ammonia cause the change of the sound propagation velocity,and then the voltage signal output by the phase detector is used to characterize the volume concentration of ammonia to be measured.The experimental results show that the sensor exhibits high sensitivity(0.11 mV/10^(-6) mV),low detection limit(0.5×10^(-6))and fast response time(T_(90)<20 s)at room temperature.