Abstract
A carbon nanotube/Fe3O4 thin film-based wireless passive gas sensor with better performance is proposed. The sensitive test mechanism of LC (Inductance and capacitance resonant) wireless sensors is analyzed and the reason for choosing Fe3O4 as a gas sensing material is explained. The design and fabrication process of the sensor and the testing method are introduced. Experimental results reveal that the proposed carbon nanotube (CNT)/Fe3O4 based sensor performs well on sensing ammonia (NH3) at room temperature. The sensor exhibits not only an excellent response, good selectivity, and fast response and recovery times at room temperature, but is also characterized by good repeatability and low cost. The results for the wireless gas sensor’s performance for different NH3 gas concentrations are presented. The developed device is promising for the establishment of wireless gas sensors in harsh environments.
Highlights
As a highly toxic compound, ammonia (NH3 ) plays a vital role in all forms of life, and it is generally an outcome of natural processes in humans, animals, and plants
The concentration of NH3 should not be higher than 0.004% (40 ppm), and the wired sensor will generate heat and may even produce electrospark, which is very dangerous in the mine
Ceramics are suitable for various environments and can be good substrate materials
Summary
As a highly toxic compound, ammonia (NH3 ) plays a vital role in all forms of life, and it is generally an outcome of natural processes in humans, animals, and plants. The concentration of NH3 should not be higher than 0.004% (40 ppm), and the wired sensor will generate heat and may even produce electrospark, which is very dangerous in the mine. A wireless passive sensor can avoid the security threat caused by sensor heating and has no energy consumption. It plays an important role when detecting gas in confined spaces [7]. There are many occasions where wireless gas sensors are needed, and the environment is usually harsh [8,9]. Ceramics are suitable for various environments and can be good substrate materials
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