Study on the characteristics of Ag doped CuO-BaTiO3 CO 2 sensors

Abstract

In this paper the characteristics of a CuO-BaTiO3 based CO 2 gas sensor was investigated. The sensitivity of the CuO-BaTiO 3based CO2 sensor was influenced by doping various metal elements such as Au, Ag, Pt, Pd, Ce, Mg, Sr, La, Zn, Fe and Bi, which were added as a pure metal or in the form of metal oxides. It was found that Ag is the most suitable additive among all substances tested. The Ag-doped CO2 gas sensor has better sensitivity and lower operating temperature, with a detection concentration range of from 100 ppm to 10%. The sensor also shows good stability. © 2002 by MDPI.