无线无源气体传感器的制备和测试

Fabrication and Test of a Wireless Passive Gas Sensor

介绍了氨气传感器的制备和测试,利用原位聚合法将聚苯胺以多壁碳纳米管为核心进行聚合反应制备出介电纳米复合材料,将制备的介电纳米复合材料喷涂到传感器上作为气体传感器的敏感层,从而制备了复合材料的氨气传感器。作为对照组,采用相同的方法制备了纯聚苯胺敏感材料,在聚合过程中未掺入多壁碳纳米管,制备了纯聚苯胺气敏材料的氨气传感器。实验结果表明,多壁碳纳米管的适量掺入有效提高了传感器的灵敏度。在最佳温度45℃下,复合材料的氨气传感器对体积分数为3×10（-4）的NH_3的灵敏度为12.070 MHz,约为纯聚苯胺传感器的4.2倍。聚苯胺和多壁碳纳米管的介电纳米复合材料对NH_3具有很好的选择性。

The fabrication and test of the ammonia gas sensor were introduced.The dielectric nanocomposites were prepared through the polymerization reaction of polyaniline with the multiwalled carbon nanotube as the core by the in-situ polymerization.By spraying the dielectric nanocomposites on the sensor as the sensitive layer of the gas sensor,the ammonia gas sensor with composite materials was prepared.As a control group,the pure polyaniline sensitive materials were prepared by the same method,while the multi-walled carbon nanotubes were not doped during the polymerization process,and then the ammonia sensor with pure polyaniline gas sensitive materials was prepared.The experimental results show that the sensitivity of the sensor is improved effectively by doping the moderate amount of multi-wall carbon nanotubes.At the optimum temperature of 45℃,the sensitivity of the ammonia gas sensor with composite materials to NH_3 with the volume fraction of 3×10^（-4） is 12.070 MHz,which is about 4.2 times that of the pure polyaniline sensor.The dielectric nanocomposites with polyaniline and multi-walled carbon nanotubes have better selectivity to NH_3.