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.