title: Nanosized gamma-Al2O3 + Nd2O3-based cataluminescence sensor for ethylene dichloride.
abstract: A gas-sensor utilizing cataluminescence (CTL) on nanosized gamma-Al2O3 + Nd2O3 for measuring low concentrations of gaseous ethylene dichloride (EDC) was developed. The results showed that gamma-Al2O3 nanoparticles as a catalyst offered high sensitivity and selectivity in the detection of EDC. The addition of a small quantity of Nd2O3 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 degrees C, and the optimal flow rate of carrier gas was 320 mL/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.
authors.affiliation: Environmental Science and Engineering Institute, Guangzhou University, 510405, Guangzhou, People's Republic of China. caoxiaoan2003@yahoo.com.cn
authors.forename: Xiaoan
authors.initials: X
authors.lastname: Cao
authors.forename: Guiming
authors.initials: G
authors.lastname: Feng
authors.forename: Haihua
authors.initials: H
authors.lastname: Gao
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Luo
authors.forename: Hailiang
authors.initials: H
authors.lastname: Lu
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D000537:Aluminum Oxide; D002138:Calibration; D005025:Ethylene Dichlorides / Q000032:analysis*; D008163:Luminescent Measurements / Q000379:methods* / Q000592:standards; D049329:Nanostructures; D009354:Neodymium; D010087:Oxides
chemical_list: D000393:Air Pollutants; D005025:Ethylene Dichlorides; D010087:Oxides; D009354:Neodymium; C024565:ethylene dichloride; C505244:neodymium oxide; D000537:Aluminum Oxide