Sb-SnO2-nanosized-based resistive sensors for NO 2 detection

Abstract

A study over Sb-promoted tin oxide nanopowders for sensing applications is reported. SnO 2 nanopowders pure and promoted with 5wt of antimony were prepared by wet chemical methods and widely characterized by TEM, XRD, and XPS techniques. Thick film resistive sensors were fabricated by depositing the synthesized nanopowders by drop-coating on interdigited alumina substrates. The sensing characteristics of the pure SnO 2 and Sb-promoted sensors for the monitoring of trace level of NO 2 were studied. The response of the sensors to water vapor was also investigated, revealing that Sb acts favorably eliminating the interference of humidity. Copyright © 2009 T. Krishnakumar et al.