Performance analysis of NH3 sensor based on GaN for human health monitoring
Objective To understand the disease markers of human exhaled gas and realize the real-time monitoring of hu-man exhaled NH3.Methods The porous GaCl3(GaN)nanoellipsoids were prepared by hydrothermal method and further high temperature nitridation,which were coated on surface of interdigital electrode with gold electrode as sensor film to obtain rapid detection sensor for NH3 at room temperature.The morphology and structure of GaN nanoellipsoids were characterized by X-ray diffraction,scanning electron microscopy and Brunauer-Emmett-Teller method,which showed that the synthesized GaN was porous nanostructure with large specific surface area.The dynamic response,selectivity,repeatability and stability of the sensor to NH3 were tested.Results At room temperature,the sensor responsivity(ΔG/G0)to 100 ×10-6 NH3 was about 448％,and the sensor exhibited fast response time(22-seconds)and recovery time(24-seconds).The GaN nanoellipsoids sensor showed good linear response for NH3 in range of(1-200)×10-6,which was used for quantitative detection of NH3.The detection limit of GaN nanoellipsoids sensor reached 178×10-9,which was used for trace detection of NH3.In addition,the gas sensing mechanism of sensor to NH3 was investigated.Conclusion It is demonstrated that the study provides the theoretical and experimental basis for research of NH3 sensor in human health monitoring.
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