Photoluminescence study of adsorption-luminescent Al2O3 sensor for determining odor substances in air

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Abstract
An adsorption-luminescent sensor enables us to discriminate and determine the vapor of odor substances by measuring temperature dependence of luminescence from the sensor (powder of (gamma) -Al2O3) which previously adsorbed odor vapor in the air. Profiles of the adsorption luminescence (AL) spectra as a function of temperature for butanol, acetone, and n- butyric acid are apparently different from each other, and these vapors of 1 to 100 ppm in concentration in the air can be determined from the total luminescence intensity. The study of photoluminescence (PL) observed for the sensor after contact with these odor vapors implies that AL is peculiar chemiluminescence during catalytic oxidation of odor vapor which produces water and surface hydroxide.

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