LC无源无线气体传感器的制备及对NH3气敏特性的研究

采用酸化后的碳纳米管与聚苯胺掺杂作为传感器的气敏材料.通过丝网印刷技术将无铅铝浆印刷在氧化铝陶瓷基板上形成电感线圈,并将制备好的气敏材料涂覆到电感线圈上,制备出LC谐振式无源气体传感器.制作成气体传感器后在NH3气氛中进行测试分析,实现了在密闭环境下的非接触测量.重点分析了在室温下NH3气体的浓度对传感器谐振频率f0的变化及响应恢复时间的影响,结果表明气体浓度在300×10-6时,传感器的灵敏度为4.499 MHz.

Preparation of LC Wireless Passive Gas Sensor and Study on the Gas Sensing Properties of Ammonia Gas

By using acidified carbon nanotubes doped with polyaniline as gas sensitive material of the sensor. The prepared gas sensitive material is coated with the inductance capacitance coupled circuit which is prepared by screen printing technology,fabricating LC resonant passive gas sensor. In the NH3atmosphere,we can test the pre-pared gas sensor so as to achieve the non-contact measurement in a closed environment.Via focusing on the analysis on the influence of the concentration of NH3gas to the resonant frequency of the sensor and the response recovery time at room temperature,the results show that the sensitivity of the sensor is 4.499 MHz at 300×10-6.