Nanosized γ ‐Al 2 O 3 + Nd 2 O 3 ‐based cataluminescence sensor for ethylene dichloride

A gas‐sensor utilizing cataluminescence (CTL) on nanosized γ ‐Al 2 O 3 + Nd 2 O 3 for measuring low concentrations of gaseous ethylene dichloride (EDC) was developed. The results showed that γ ‐Al 2 O 3 nanoparticles as a catalyst offered high sensitivity and selectivity in the detection of EDC. The addition of a small quantity of Nd 2 O 3 increased the intensity of CTL more than two‐fold. Quantitative analysis was performed at a wavelength of 400 nm and at an optimal temperature of 279°C, and the optimal flow rate of carrier gas was 320 mL[sol ]min. Under the optimized conditions, the linear range of CTL intensity vs. concentration is 6–5000 ppm ( R = 0.9996; n = 7), with a detection limit of 2 ppm. The response time is <5 s. No interference or only very low levels of significant interference were observed when substances such as formaldehyde, n ‐hexane, methyl benzene, carbon tetrachloride, chloroform and benzene were passed through the sensor. Copyright © 2005 John Wiley & Sons, Ltd.