Abstract
Many nano-metal oxides are claimed to be responsive to H 2 at room-temperature, but their response rates may be too low for the signal to reach equilibrium quickly. We investigated the H 2 -induced resistive response of palladium-coated supersonic cluster beam deposited tungsten oxide (Pd/SCBD WO 3 ) films at temperatures T sen between 20 and 140 °C. They are constructed of genuine nano WO 3 clusters (3–5 nm) loosely packed together, and have a high porosity. Slight increase of T sen from room-temperature greatly speeds up the response rate and gives a strong apparent sensor response. Other advantages include excellent cyclic stability and selectivity against vapors of various organic compounds; negligible influence from moisture and mild ambient pressure dependence.
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