Abstract
With the rapid development of carbon nanotubes gas sensor, the sensitivity of the sensing response is becoming more and more demanding. Different from the traditional studies on gas-sensitive materials, this paper combines the microscopic dimensional effects and physical properties of fractal geometry theory from the structure and morphology of sensor devices. The electrode structures of carbon nanotubes gas sensor is designed and optimized by Hilbert–Piano curve. Simulation experiments demonstrate that the electric field intensity and hot spot distribution of the fractal electrode are superior to those of the traditional interdigital electrode. Moreover, a novel chemiresistive gas sensor is fabricated combining the characteristics of carbon nanotubes and fractal geometry, and a test with exposure to nitric oxide showed that the sensors with fractal electrode structures improved the gas sensing sensitivity over sensors with traditional geometrical structures. It provides a new idea for the exploration of gas sensing technology.
Highlights
With the rapid development of carbon nanotubes gas sensor, the sensitivity of the sensing response is becoming more and more demanding
In 2000, Kong et al discovered that carbon nanotubes (CNTs) exhibits the electrical properties of a p-type semiconductor and used this as a theoretical basis for the preparation of a CNTs gas sensor, which is gas sensitive to NO2 and N H3 at room temperature[23]
We aim to test the feasibility of multi-walled carbon nanotubes gas sensor structural optimization for performance improvement and the potential of fractal geometry in the development of gas sensors
Summary
With the rapid development of carbon nanotubes gas sensor, the sensitivity of the sensing response is becoming more and more demanding. A novel chemiresistive gas sensor is fabricated combining the characteristics of carbon nanotubes and fractal geometry, and a test with exposure to nitric oxide showed that the sensors with fractal electrode structures improved the gas sensing sensitivity over sensors with traditional geometrical structures. It provides a new idea for the exploration of gas sensing technology. Since increasing the intensity of the electric field between the electrodes can increase the carrier migration speed between the gas-sensitive material and the gas molecules, increase the oxidation–reduction reaction rate, and thereby improve the sensitivity of the sensor
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