Room temperature trimethylamine gas sensor based on GaN nanofilm
Trimethylamine is widely used in the industrial production and laboratory.Due to its toxicity and volatility,it is particularly important to develop sensors that can detect it at room temperature.The GaN nanofilm was prepared using gas spraying and high temperature nitriding techniques.Using a magnetron sputtering,the nanofilm was then coated with gold on both ends as the electrode to create the gas sensor.The GaN nanofilm sensor exhibits a response value of 2.54ppm-10ppm of trimethylamine,with respective response and recovery times of 41 s and 139 s,respectively.The detection limit of the sensor is 1 ppm,and the sensor also shows a good linear response in the range of lppm-50ppm trimethylamine concentration.In addition,the sensor also performs well in the repeatability,stability and selectivity tests.The surface of the GaN nanofilm sensor is coated with numerous nanoparticles,forming a unique structure that facilitates the adsorption of gas molecules.The presence of a significant quantity of chemisorbed oxygen on the nanofilm surface contributes to the exceptional trimethylamine sensitivity of the sensor.
GaNtrimethylaminenanofilmgas sensorroom temperature
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