摘要
研究了相对湿度对聚苯胺氨气传感器性能的影响，发现相对湿度（RH）在10％～80％，氨气浓度在10—2500HL／L范围内时，聚苯胺膜对氨气的相对灵敏度随氨气浓度的增加而增加，在相同氨气浓度下响应时间随湿度的增加而变短，当氨气浓度小于400μL／L时，相对湿度则对相对灵敏度影响不大。但当氨气浓度大于500μL／L，相对湿度大于40％时，在相同氨气浓度下，随着相对湿度的增大，响应时间变短，但相对灵敏度降低．因为水分子加入后，NH，和H：0形成了大量更易于使聚苯胺去质子化的NH4OH分子，从而加快了反应速度，缩短了响应时间，而大量水分子（RH≥40％）的质子化作用降低了相对灵敏度．因此相对湿度是聚苯胺氨气传感器必须考虑的重要因素之一．
Polyaniline is an emerging ammonia sensor material,mainly due to its reversible protonic doping- base dedoping property. Though many factors influence the performance of ammonia sensor, this work focuses on the role of relative humidity （RH） on polyaniline ammonia sensor. For RH from 10% to 80% ,the relative sensitivity of polyaniline film on ammonia was enhanced with increasing ammonia concentration when it changed from 10 txL/L to 2500 txL/L, however, when ammonia concentration was less than 400 p,L/L, no obvious change in relative sensitivity was observed with various RH. At fixed ammonia concentration, for RH above 40% and ammonia concentration over 500 IxL/L, fast response was observed while relative sensitivity decreased with the increasing RH,which was due to the increasing formation of NH4 OH from the reaction of NH3 and H20 at higher humidity. The NH4 OH formation reaction was accelerated and response time was shortened since polyaniline was more easier to be doped by NH4OH,while the protonation of water when RH was over 40% reduced the relative sensitivity. Therefore, RH must be considered as one of the important factors for polyaniline ammonia gas sensor.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2014年第1期156-163,共8页
Acta Polymerica Sinica
关键词
聚苯胺
氨气
相对湿度
相对灵敏度
Polyaniline, Ammonia sensor, Relative humidity, Relative sensitivity
