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Impressive room-temperature gas-sensing capabilities have been reported for nanomaterials of many metal oxides, including SnO 2 , ZnO, TiO 2 , WO 3 , and Fe 2 O 3 , while little attention has been paid to the intrinsic difference among them. Pt-SnO 2 and Pt-ZnO composite nanoceramics have been prepared through convenient pressing and sintering. The former shows strong and stable responses to hydrogen in 20% O 2 -N 2 (synthetic air) at room temperature, while the responses to hydrogen in N 2 cannot be stabilized in limited times; the latter shows strong and stable responses to hydrogen in N 2 , while the responses to hydrogen in synthetic air are greatly depressed. Further analyses reveal that for Pt-ZnO, the responses result from the reaction between hydrogen and oxygen chemisorbed on ZnO; while for Pt-SnO 2 , the responses result from two reactions of hydrogen, one is that with oxygen chemisorbed on SnO 2 and the other is hydrogen chemisorption on SnO 2 . These results reveal two different room-temperature hydrogen-sensing mechanisms among MOXs, which results in highly contrasting room-temperature hydrogen-sensing capabilities attractive for sensing hydrogen in oxygen-contained and oxygen-free environments, separately.

Room-Temperature Hydrogen-Sensing Capabilities of Pt-SnO2 and Pt-ZnO Composite Nanoceramics Occur via Two Different Mechanisms