The effects of palladium–gold on the chemisorptive activities of thin film tin oxide

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Abstract
A thin, discontinuous palladium–gold deposit (≤3.5 nm) was evaporated on top of thin film tin oxide (∼100 nm). The resistance of the resulting device decreased greatly with increasing ambient content of propylene (C3H6) or hydrogen (H2). The device has the capability of detecting 10 ppm of C3H6 or H2 in air. These observed phenomena may be explained by bifunctional catalysis (activation of the adsorbate, enhancement of chemical reaction, and electronic interaction) and the surface sensitive electronic properties of semiconductors. The possibility of applying the bifunctional catalysis concept for sensor fabrication is examined. The advantage of using thin film samples for catalysis studies is discussed.
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