Article ID Journal Published Year Pages File Type
1463092 Ceramics International 2013 5 Pages PDF
Abstract
Nanosized powders of La0.80Sr0.20Fe0.95Cu0.05O3−w were investigated in terms of structural, morphological, chemical and surface properties by using several characterization techniques. The XPS and IR measurements showed the presence of surface hydroxide and carbonates species. After calcination of the powders at 900 °C the amount of carbonates decreased but was still significant. The sensing activity of thick film based on La0.80Sr0.20Fe0.95Cu0.05O3−w was tested as a function of relative humidity and the results indicate that (i) after one year of ambient storage the sensing material lost quite completely its sensitivity to humidity, (ii) the sensing activity of the film was mostly re-activated after a thermal treatment at 900 °C for 2 h, and (iii) the huge shift of the detection limit to low RH caused by the presence of 5 mol% Cu is also restored.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
Authors
, , , ,