The sensitivity of sensor structures with oxide graphene exposed to selected gaseous atmospheres

The paper presents the results of investigations on the resistive structure with a graphene oxide (GO) sensing layer. The effects of dangerous gases (hydrogen and nitrogen dioxide) on the structure were studied; the resistance changes were examined during the flow of the selected gas in the atmosphere of synthetic air. Measurements were performed with a special emphasis on the detection of low concentrations of the analyzed gases. The reactions of the sensing structure to the effect of nitrogen and synthetic air at different humidity were also tested. Much attention was also paid to the fast response of the sensor to the changes in the gas atmosphere. The thin palladium layer (similar to 2 nm) has been applied in order to improve the sensing properties of the structure. The investigations were performed in the temperature range from RT to 120 degrees C and the analyzed gases in synthetic air were batched alternately with pure synthetic air.