Abstract
We demonstrated the possibility of selective detection of hydrogen, ethanol, hydrogen sulfide, carbon monoxide, methane and ammonia gas using metal oxide gas sensor operating in non-stationary thermal regime. This non-stationary regime consists in fast heating of the sensing layer to high temperature followed by temperature stabilization at lower temperature. The analysis of the shape of the curve describing the sensor resistance as a function of time during this measurement cycle enables the quantitative analysis of gas mixture. The investigation of kinetics of the process in non-stationary regime permits to understand the mechanism of the processes on the surface of sensing material.
Highlights
During last 15–20 years, the main direction of the development of sensor science was a material science, the development and improvement of sensing materials
We demonstrated the possibility of selective detection of hydrogen, ethanol, hydrogen sulfide, carbon monoxide, methane and ammonia gas using metal oxide gas sensor operating in non-stationary thermal regime
The analysis of the shape of the curve describing the sensor resistance as a function of time during this measurement cycle enables the quantitative analysis of gas mixture
Summary
During last 15–20 years, the main direction of the development of sensor science was a material science, the development and improvement of sensing materials. It is necessary to use gas sensing layers, which could give in combination with specially selected temperature regimes typical extrema of functions characterizing sensor resistance as a function of time during measurement cycle. These extrema can make easier the problem of qualitative analysis, permit us to distinguish one gas from another in a wide range of concentrations. The application of impulse heating regime enables the saving of heating power and, respectively use autonomous power source This approach permits an increase in efficiency of qualitative gas analysis. The choice of the composition of gas sensing layer was dictated by concrete task, qualitative analysis of hydrogen in air
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