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Adsorption/combustion-type gas sensors employing mesoporous γ-alumina (mp-Al2O3) powders loaded with core(Au)/shell(Pd) nanoparticles, which were synthesized by sonochemical reduction, (n(Au/Pd)/mp-Al2O3, n: the amount of Au/Pd nanoparticles loaded, Pd loaded onto the mp-Al2O3 powders was reduced (≤ 0.5 wt%). These sensing properties seem to be largely dependent on the morphological and compositional characteristics of Au and Pd loaded on the γ-alumina surface. In addition, the n(Au/Pd)/mp-Al2O3 sensors showed much larger response to ethanol than those to toluene and n-hexane, probably because of the difference in the magnitude of polarity (dipole moment and dielectric constant) of their molecules. However, the sensors obviously detected even 10 ppm n-hexane with the extremely low dipole moment and dielectric constant. These results promise that the n(Au/Pd)/mp-Al2O3 sensors can detect the lower concentration of these gases as well as other VOCs.

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Technology Center，Yazaki Corp．(Susono−shi，Shizuoka410−1194，Japan) aGas Equipment Development Division，Yazaki Meter Co．，Ltd．αenryu−sh呈，Shizuoka431−3393，Japan) bDepartment of Materials Science and Engineering，Faculty of Engineering，Nagasaki University(Nagasak1一shi，Na− gasaki852−8521，Japan)

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