Abstract
In this study, the electrical resistance relative to the water absorption of humidity sensors made from Ni(Al, Fe)2O4-TiO2 ceramic is investigated. This ceramic body forms a spinel structure after sintering and exhibits a porous structure. Porous ceramics easily absorb and desorb water vapour through the pores, and the electrical conductivity is enhanced by water absorption. In this ceramic system the conduction mechanism is ionic. The Ni(Al, Fe)2O4-TiO2 porous ceramic has a high humidity activity, short response time for humidity detection (less than 40 s), and high stability. The highest sensitivity among the specimens studied is found in Ni(Al0.875Fe0.125)2O4−5 mol% TiO2.
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Wu, L., Wu, C.C. & Her, J.C. Ni(Al, Fe)2O4-TiO2 ceramic humidity sensors. J Mater Sci 26, 3874–3878 (1991). https://doi.org/10.1007/BF01184985
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DOI: https://doi.org/10.1007/BF01184985