Abstract
A new CO gas sensor of Perovskite-type oxide, semiconducting doped BaTiO 3 based PTCR ceramics was studied. PTCR ceramic is capable of detecting carbon monoxide in the concentration range of 1-5% in the PTCR / NTCR regionbelow/above the critical temperature, by means of higher barrier potential of PTCR / NTCR effect. The phenomenon is based on anionic adsorption, the extreme activity of the oxygen atoms at the surfaces of grain boundaries at the lower temperature while the bulk defect structures are frozen-in. The interaction between CO gases with the oxygen at the surface layer of the PTCR ceramics participates in the sensing reaction, and the itinerant electron comes from the conduction band of the n-type semiconducting ceramics. The creation of the new electron traps in the grain boundaries bring about to a decrease in resistivity of the material. The physisorprion between the CO gas on the surface of the PTCR grains is the key for the ceramics working at lower temperature. The adsorption of CO gas on PTCR ceramics and mechanism of PTCR-CO working in lower temperature as well as kinetic process of defects are discussed.
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