车用氨气传感器设计与性能实验

摘要

TiO2-SnO2 composite nanocrystalline of ammonia gas sensor were prepared by the low temperature hydrothermal method.A new film-type ammonia gas sensor was designed with TiO 2-SnO2 composite nanocrystallines transferred onto an alumina ceramic tube with Au electrodes by dip-coating method .These characteristic tests of ammonia gas sensors were carried out on the traits of sensitive performance ,dynamic response ,interference and stability in gas sensor static test system .The conclusion was got based on TS6 composite nanocrystalline .It shows that the sensitivity of ammonia gas sensor was 96.3%,the dynamic response time was 12 s,and the recover time was 18 s.The response value of ammonia gas sensor is attenuated about 6.8%,when ammonia gas sensor is applied continually on the automobile about 12 months,and its normal time is 6.3 months.These are ensured that ammo-nia gas sensor based on TS 6 composite nanocrystalline can real-time detect the leaked ammonia concentration on selective catalytic reduction (SCR) system for vehicle.%以低温水热法制备了TiO2－SnO2复合纳米晶粒，采用提拉法涂敷于带有金电极的氧化铝陶瓷管表面形成敏感薄膜，设计了一种新型的薄膜式氨气传感器。在气体传感器静态测试装置上，测试了氨气传感器敏感特性、温度特性、动态响应、抗干扰和湿度特性。结果表明，以TS6为敏感薄膜的氨气传感器灵敏度为96.3％，动态响应时间为12 s，恢复时间分别为18 s。在汽车上连续使用12个月，响应衰减了6.8％，响应正常时间为6.3个月。表明了以TS6为敏感薄膜的氨气传感器可用于汽车选择性催化还原（ SCR）系统氨气泄露在线检测。