Influence of silver as an additive on BaTiO3-CuO thin film for CO2 monitoring

Sensitivity of BaTiO3-CUO semiconductor thin films to carbon dioxide is analyzed in a concentration range from 500 to 10,000 ppm and at different working temperatures (between 200 and 300 degrees C). Impedance measurements are performed under the mentioned conditions in order to test the electrical response of BaTiO3-CuO samples without additives and with Ag. The results show a sensitivity enhancement both in resistance and capacitance when Ag is added. However, the response and recovery times remain unchanged in the samples with Ag. (C) 2007 Elsevier B.V. All rights reserved.