Abstract
AbstractA model gas sensor system, Pd/SnO2(110), has been investigated using XPS, UPS, ISS and 4‐point conductivity measurements. The growth of Pd and its chemical interaction with the SnO2 surface were studied in the 0.1–10.0 monolayer equivalent (ML) regime. It was found that the Pd overlayer grows by clustering at 300 K and that the deposited Pd is primarily metallic by 3 ML. Heating Pd‐covered surfaces up to 800 K causes a decrease in the XPS Pd/Sn 3d intensity ratio, possibly due to further clustering of the overlayer above room temperature. Annealing did not, however, change the local metallic nature of the deposited Pd. The gas sensing behavior of these model interfaces was investigated by measuring the sheet conductance at different hydrogen pressures. The increase in conductance for a 3 ML Pd/SnO2(110) surface was 16 times greater than that for the Pd‐free surface at 10−5 Torr H2. This enhancement by Pd is duscussed in terms of a ‘spillover’ effect.
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