基于GaN/Ti3C2Tx的TMA传感器气敏性能及其应用研究OA北大核心CSTPCD

In this paper,a new type of gallium nitride(GaN)/Ti3C2Tx composite material was synthesized by solvo-thermal method and nitriding method,and the sensing characteristics of trimethylamine(TMA)gas sensor based on GaN/Ti3C2Tx composite were studied.Through a series of characterization methods,the morphology and elemental composition of the composites were analyzed,and the successful composite of GaN and Ti3C2Tx was confirmed.The results show that GaN/Ti3C2Tx sensor can efficiently detect 1～200 ppm TMA gas at room temperature,and the detection limit of TMA is re-duced from 10 ppm to 1 ppm compared with pure GaN sensor.In addition,the gas sensing results of the composite sensor further confirm its good anti-interference characteristics and long-term stability.The gas-sensitive mechanism of GaN/Ti3C2Tx composite sensor and the reason of its improved gas-sensitive performance compared with pure GaN sensor are ex-plained by using the surface depletion layer model.Finally,a contactless TMA gas detection device was developed in this paper,and the test results show that the device is expected to achieve efficient real-time detection of exhaled air in patients with liver and kidney disease,and has great application potential in early screening of liver and kidney diseases.