Cao Xiaoan, Feng Guiming, Gao Haihua, Luo Xiaoqing, Lu Hailiang
Environmental Science and Engineering Institute, Guangzhou University, 510405, Guangzhou, People's Republic of China.
Luminescence. 2005 May-Jun;20(3):104-8. doi: 10.1002/bio.823.
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.
开发了一种利用纳米γ-Al2O3 + Nd2O3上的催化发光（CTL）来测量低浓度气态二氯乙烷（EDC）的气体传感器。结果表明，γ-Al2O3纳米颗粒作为催化剂在检测EDC时具有高灵敏度和选择性。添加少量Nd2O3使CTL强度增加了两倍多。在400 nm波长和279℃的最佳温度下进行定量分析，载气的最佳流速为320 mL/min。在优化条件下，CTL强度与浓度的线性范围为6-5000 ppm（R = 0.9996；n = 7），检测限为2 ppm。响应时间<5 s。当甲醛、正己烷、甲苯、四氯化碳、氯仿和苯等物质通过传感器时，未观察到干扰或仅观察到非常低水平的显著干扰。
