The application of nanocrystalline BaTiO3-composite films as CO2-sensing layers

A new generation of solid state sensors based on nanocrystalline BaTiO3 fil ms containing various semiconducting oxides has been developed. The sensors were fabricated from BaTiO3-based nanopowder mixtures using thick film tec hnology and were characterized regarding their CO2-gas sensitivity at diffe rent operation temperatures and gas environments. It was found that the sen sors operate over a wide range of CO2 concentrations. Interfering gases hav e only minor effects on the sensor response. By using miniaturized Al2O3-su bstrates as carriers for the sensitive nanocrystalline layer a significant decrease of the power and powder consumption for each sensor was achieved. (C) 1999 Elsevier Science S.A. All rights reserved.