Influence of sensitive layer thickness of SnO2 gas sensor on response performance of ethanol gas
In order to explore the influence of the thickness of the sensitive layer on the response performance of the sensor in SnO2-ethanol response system,SnO2 hollow nanofibers are prepared by electrospinning.The prepared nanofibers are used to fabricate resistive gas sensors with different sensitive layer thicknesses.And the response performance of the prepared sensor to ethanol gas is studied.The test results show that the thickness of the sensitive layer changes the slope of the response value of gas sensor and the ethanol gas volume fraction in the double logarithmic coordinate system,and the influence of the thickness of the sensitive layer on the slope is also different with the change of temperature.The thickness of the sensitive layer changes the optimal response temperature of the gas sensor.The smaller the thickness of the sensitive layer,the higher the optimal response temperature.During the diffusion process of the target gas inside the sensitive material,it will be adsorbed on the surface of the sensitive material to cause a heterogeneous catalytic reaction,and the thickness of the sensitive layer of gas sensor will affect the diffusion of the target gas,thereby change the gas composition and content in the microenvironment inside the sensitive layer,and have an impact on the response performance of the gas sensor.