Abstract
A rapid and sensitive cataluminescence (CTL)-based gas sensor using nanosized Cr4TiO8 as a probe was proposed for direct determination of acetone in air. Trace acetone was firstly absorbed on active carbon at room temperature to concentrate, then desorbed at 84°C to determine. The sensor showed high selectivity to acetone at wavelength of 430nm, satisfying activity at temperature of 366°C and good stability at carrier flow rate of 115 ml/min. The linear range of CTL intensity versus concentration of acetone was 2.5~150 mg/m3, and the detection limit (3σ) was 1.2 mg/m3. The recovery of artificial sample was 94.1%—106.2% by this method. The response to formaldehyde and ethanol was insignificant, and there was no response to SO2, CO and benzene.
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