Room Temperature Gas Sensor Based on GaN/PANI Micro Composite with Ultrahigh NH3 Gas Sensibility
[Purposes]This study is carriedout to discuss on the response of gallium nitride(GaN)and polyaniline(PANI)composites to ammonia(NH3)at room temperature.[Methods]The GaN mi-cron blocks were prepared by in-situ nitridation by using gallium oxide(Ga2O3)as the raw material,then GaN/PANI gas sensing prototypes were fabricated by in-situ polymerization after pre-composition between GaN and PANI.The samples were characterized.[Findings]It is observed that GaN micron blocks are connected to the mesh-like PANI from morphological result of GaN/PANI gas sensor,and proved the materials are well composited.The experiments are conducted to explore the sensing properties of pure GaN and GaN/PANI.In experimental conditions,the response of GaN/PANI gas sensor to 100×10-6 NH3 is 80.73%,which is 1.7 times that of pure GaN to the same con-centration of NH3 and the limit of detection of GaN/PANI is determined to be 1×10-9 while that of pure GaN is 1×10-6 level.The gas sensing mechanism of GaN/PANI sensors is discussed,which provides a theoretical and experimental basis for the development of GaN composition.From this re-sult.The GaN/PANI gas sensor is proved to be an excellent candidate to detect NH3 at room tempera-ture.
GaN/PANINH3 gas sensorin-situ nitridationin-situ polymerization
万方数据
维普
