期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 68, 期 1-3, 页码 140-145出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/S0925-4005(00)00474-3
关键词
thick film; TiO2; gas-sensor; electron microscopy; differential thermal analysis
Pure and Nb-doped TiO2 thick-films were prepared by screen-printing, starting from nanosized powders. Grain growth and crystalline phase modification occurred as consequence of firing at high temperature. It has been shown that niobium addition inhibits grain coarsening and hinders anatase-to-rutile phase transition. These semiconducting films exhibited n-type behavior, while Nb acted as donor-dopant. Gas measurements demonstrated that the films are suitable for CO or NO2 sensing. Microstructural characterization by electron microscopy and differential thermal analysis (DTA) highlights the dependence of gas-sensing behavior on film's properties. (C) 2000 Elsevier Science S.A. All rights reserved.
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