Abstract
Cataluminescence (CTL) is a kind of chemiluminescence emitted during catalytic oxidation. A new method for analytical detection of mixed organic vapors in air is proposed using a new CTL-based gas sensor made of γ-Al2O3, catalyst doped with Dy phosphor. The CTL spectra of ethanol and acetone on γ-Al2O3 catalyst consist of two components of λL(550nm) and λs (420nm). The CTL spectra for the same sample gases on γ-Al2O3, doped with Dy have extra spectrum components peaking at λD1 (580nm) and λD2 (480nm), so that the sensor sensitivity is increased. As the CTL intensities at λD1, λs and λL show different temperature and gas concentration dependence respectively, these may result from different reaction processes. Two CTL intensities of 530 and 580 run are measured for air containing ethanol and acetone of concentrations of CE and CA. As the CTL intensities are the different single valued function of CE and CA, we can obtain the constituent concentrations of mixed organic vapor of ethanol and acetone by measuring the CTL intensities of two wavelengths of 530 and 580 nm.
