THE EFFECT OF SINTERING AND PD-DOPING ON THE CONVERSION OF CO TO CO2 ON SNO2 GAS SENSOR MATERIALS

The principal aim of this work is to study the effect of the processes of sintering and Pd doping of SnO2 gas sensor materials on the conver sion of CO to CO2. For this purpose, the gas phase above screen printe d sensor material is investigated using FTIR spectroscopy, while surfa ce area, porosity and particle size measurements an performed on the S nO2 powders. During sintering, larger agglomerates of primary particle s are formed, which results in a larger conversion degree of CO. The e ffect of Pd doping of the tin dioxide film on the CO conversion is mor e pronounced. The transformation of CO starts at a lower temperature a nd the conversion degree increases remarkably. (C) 1997 Elsevier Scien ce S.A.