CO2 Gas Sensing Properties of Screen-Printed La2O3/SnO2 Thick Film

The present investigation deals with the fabrication of CO 2 gas sensor based on La 2 O 3 /SnO 2 metal-oxide material. In this paper, the sensitive material was prepared by La 2 O 3 /SnO 2 nanopowder and the addition of 1 wt.% and 3 wt.% platinum (Pt) using high-speed ball milling method. The sensitive film prepared by sensitive powder was printed on alumina (Al 2 O 3 ) substrate by screen printing method. This film was characterized by X-Ray powder diffraction spectroscopy, and Field-emission scanning electron microscopy. As a result, the prepared 3 wt.% Pt/La 2 O 3 /SnO 2 thick film sensitive paste exhibits a high sensitivity to increasing the CO 2 gas concentration at 225 °C in air atmosphere.