Gas Sensor Based on Macro and Micro Fractal Geometry
Sensitivity and lower detection limit are critical performance index of gas sensor.The utilization of fractal geometry in the design of both macro and micro structures of sensors were employed in this paper as a means of enhancing sensitivity and lower detection limit.In the macro structure,Koch snowflake cube and Menger sponge were used to design the structure of sensor substrate,the fractal substrate was used to increase the effective contact area to improve gas sensing performance.In the micro structure,fractal dimension was introduced to characterize the micro structure and properties of films.Au/MWCNT sensors with different Au content were prepared and tested with NO2 as the target gas at different temperatures and humidity.Fractal analysis and experimental results show that the gas sensing performance of film can be characterized by fractal dimension,and the sensors with fractal structure substrate and 40%Au/MWCNTs films have the highest fractal dimension and sensitivity,which is more than 9 times that of those with traditional structures(Cylinder)and MWCNTs films.
gas sensorfractal filmsensitivitylower detection limitfractal dimensionfractal geometry
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